# History of Yash

## Yash 2.62 (Unreleased)

- [line-editing] Updated the completion script for tar to support GNU

tar 1.35 and libarchive (bsdtar) 3.8.7.

- Updated the sample initialization script (yashrc):

- When `$TERM_PROGRAM` is `vscode`, the script now sends the current

working directory to the VS Code shell integration.

## Yash 2.61 (2026-03-03)

- The `configure` script now accepts the `--disable-doc` option to

omit installing the manual pages.

- The `configure` script now has minimal cross compilation support.

Use the `--host=HOST` option to specify the cross-compilation

target.

- Fixed a bug where the `configure` script could produce false

positive results for function checks when an optimizing compiler

eliminates the test code. The `configure` script now uses the

`-fno-builtin` compiler option when compiling function check

programs.

- The `times` built-in now uses the `getrusage` function to obtain

resource usage statistics on systems where it is available, which

improves precision.

- Updated the sample initialization script (yashrc):

- The script no longer suggests moving the history file from

`~/.yash_history` to `${XDG_STATE_HOME}/yash/history` if they

resolve to the same file.

- [line-editing] Fixed a bug where attempting to auto-complete

arguments for unknown commands when the `PREFIX` variable is defined

would result in an error message.

- [line-editing] Added completion for `mount`, `sv`, `aria2c`,

`mkinitcpio`, `7z`, and `hdparm`.

## Yash 2.60 (2025-09-15)

- Updated the sample initialization script (yashrc):

- Redefined the `open` function for WSL to use `rundll32.exe`

instead of `cmd.exe` for better stability.

- `$VISUAL` is now preferred over `$EDITOR` for the default value of

`$FCEDIT`.

- [line-editing] The "vi-edit-and-accept" command now honors the

`VISUAL` and `EDITOR` variables, so that you can use your favorite

editor.

- [line-editing] Added completion for `fd`, `dvtm`, `mw`

(mutt-wizard), and `typst`.

- [line-editing] Completion for `man` now supports the `-l`

(`--local-file`) option.

- The `export`, `readonly`, and `typeset` built-ins now print the `--`

separator before the variable names when printing variables whose

names begin with a hyphen (`-`), so that the output can be safely

re-parsed by the shell. The same applies to function names.

- Fixed a bug where the shell continued to export the previous value

of an array even after it was updated using the `array` built-in.

Also fixed an issue where the internal cache was not refreshed for

the `PATH`, `CDPATH`, and `YASH_LOADPATH` variables after being

modified via the `array` built-in.

- Fixed a bug where single quote characters (`'`) in the `word` of

parameter expansions of the forms `${foo+word}`, `${foo-word}`,

`${foo=word}`, and `${foo?word}` were treated as quoting characters

when the expansion was in double quotes.

- Fixed a bug where tilde expansion was performed on the `word` of

parameter expansions of the forms `${foo+word}`, `${foo-word}`,

`${foo=word}`, and `${foo?word}` even when the expansion was in

double quotes.

## Yash 2.59 (2025-05-13)

- Improved POSIX.1-2024 support:

- When an error that would terminate a non-interactive shell occurs

in an interactive shell, the shell now discards any remaining

commands that were typed but not yet executed, and immediately

continues to read the next command. Parameter expansion errors and

variable assignment errors are examples of such errors.

- When a foreground job suspends in an interactive shell, the shell

now discards any remaining commands that were typed but not yet

executed, and immediately continues to read the next command.

- The shell now considers a job to be suspended when any child

process suspends in a pipeline, instead of when all child

processes suspend.

- Patterns no longer expand to the filename `.` or `..` in pathname

expansion.

- When the `exit` built-in is used without an operand in a trap

action, the shell now exits with the exit status of the last

command executed before the trap action, instead of the exit

status of the last command executed in the trap action.

- The `read` built-in now returns a more specific exit status

depending on the cause of the error.

- The `read` built-in now supports the `-d` option, which can be

used to specify a delimiter character.

- The `readonly` built-in now refuses to make the `$LINENO`,

`$OLDPWD`, `$OPTARG`, `$OPTIND`, and `$PWD` variables read-only in

the POSIXly-correct mode.

- The `test` (`[`) built-in no longer accepts binary operators `-a`

and `-o` and parentheses `(` and `)` in the POSIXly-correct mode.

- The `trap` built-in now supports the `-p` option in the POSIXly-

correct mode. When the `-p` option is used, the built-in prints

all traps without filtering out traps that are not set.

- The `trap` built-in now also reports signals that are ignored

because the program that invoked the shell has set the signal

to be ignored.

- The `wait` built-in no longer returns when the target process is

suspended if job-control is on. The built-in now waits for the

target process to exit or be terminated by a signal regardless

of mode.

- The `true`, `false`, and `pwd` built-ins are now substitutive

built-ins.

- The `cd` built-in now exits with status code 5, when an empty

operand is supplied.

- The `cd` built-in now returns exit status 1 if the `$PWD` or

`$OLDPWD` variable cannot be updated because it is read-only.

- The interactive shell now errors out if pathname expansion applied

to a file redirection operand results in more than one pathname,

regardless of whether the POSIXly-correct mode is enabled.

- The shell now becomes interactive if the shell is reading commands

from the standard input and the standard input and standard error

are both connected to a terminal. Previously, the shell became

interactive only if there was no command line operand as well.

- Job control can now be enabled even if the shell does not have a

controlling terminal.

- If the job-control shell is started in the same process group as

the session leader, the shell now forces the process group to be

in the foreground, rather than suspending the shell itself until

brought to the foreground by some other means.

- The shell now returns exit status 128 when encountering a command

read error.

- When the shell is exiting with an exit status that indicates that

that the last command was terminated by a signal, the shell now

terminates with the same signal to propagate the command's

termination status.

- When an interactive shell starts an asynchronous command, its job

number and process ID are now printed to the standard error.

- The `printf` built-in now treats as an error a numeric operand

that starts with a quote followed by more than one character.

For example, `printf '%d' '"ab'` used to silently ignore the

character `b`, but now it is treated as an error.

- When a field is made up of a single tilde expansion that expands

to an empty string, the field is no longer removed from the

command line words.

- When a tilde expansion produces a directory name that ends with a

slash and the expansion is followed by a slash, the trailing slash

in the directory name is now removed to maintain the correct

number of slashes.

- The syntax for specifying a file descriptor with a variable name in

braces before a redirection operator is now reserved for future

implementation. The syntax is now treated as a syntax error.

- [line-editing] Updated the completion scripts to support Git

2.48.1.

- [line-editing] Added completion for `git-mv`, `bmake`, `gmake`,

`fnf`, `cmus`, `cmus-remote`, and `catgirl`.

- [line-editing] Completion for `cd` and `pushd` no longer incorrectly

performs pathname expansion on the directory names listed in

`$CDPATH` before searching for candidate directories.

- Fixed a possible crash when the `read` built-in reads input in an

interactive shell.

- Subshells created for executing a process redirection in a job-

control shell now ignore the `SIGTSTP` signal.

- Added a workaround for an apparent bug in glibc's fsetpos function

that prevents the shell from updating the history file.

- Previously, you could enable job control in a subshell by setting

the `-m` option inside the subshell. This undocumented behavior has

been removed.

## Yash 2.58.1 (2025-02-04)

- Updated the sample initialization script (yashrc):

- Version 2.58 changed the default `$HISTFILE` location to

`${XDG_STATE_HOME}/yash/history`, but the initialization script

was not making the containing directory. This was causing the

shell to fail to save the history file. The initialization script

now creates the directory if it does not exist.

- [line-editing] Version 2.58 added completion for fzy, but the NEWS

file did not mention it. This has been fixed.

- Fixed a test case in `tests/job-y.tst` that was failing when run as

root.

## Yash 2.58 (2025-02-02)

- The location of the initialization files can now be configured

using the `XDG_CONFIG_HOME` variable (except in POSIXly-correct

mode).

- [line-editing] Command line prediction now works in the vi command

mode.

- [line-editing] Added completion for fzy and git-restore.

- [line-editing] Added completion for git-merge's --continue option.

- [line-editing] The completion for the `.` built-in now suggests

directory names for the first operand even before the user enters a

slash.

- Improved POSIX.1-2024 support:

- Case command items now can be terminated by `;&` instead of `;;'

to force the shell to execute the next item.

- The non-standard terminators `;|` and `;;&` are also supported

to resume pattern matching with the next item unless in the

POSIXly-correct mode.

- Dollar-single-quotes are now supported.

- Declaration utility semantics is now supported. Assignment-like

arguments to the `export`, `local`, `readonly`, and `typeset`

built-ins are now expanded in the same way as assignments are

expanded.

- The `printf` built-in now supports position specifiers in format

strings as in `printf '%2$s %1$s\n' foo bar`.

- The `cd` and `pushd` built-ins now support the `-e` option, which

can be used to see if the `$PWD` variable is successfully updated.

- The exit status of the `getopts` built-in is now 2 on any error.

- After the `bg` built-in resumed a job, the `!` special parameter

expands to the process ID of the job.

- An interactive shell no longer exits on an error in the `exec`

built-in, even if the POSIXly-correct mode is on.

- The shell's syntax now always allows `esac` as the first pattern

of a case branch as in `case esac in (esac|case) echo ok; esac`.

Previously, it was a syntax error in the POSIXly-correct mode.

- The exit statuses returned from the `cd`, `pushd`, and `popd`

built-ins have been updated to make it easier to distinguish the

reasons for failure.

- Fixed a potential crash caused by an expansion error in nested

parameter expansion.

- Updated the sample initialization script (yashrc):

- The default `$HISTFILE` is now set to

`${XDG_STATE_HOME}/yash/history` unless `${HOME}/.yash_history`

exists, in which case the latter is used and a warning is

printed. To suppress the warning and keep using the previous

location, you can set the `$HISTFILE` variable before the sample

initialization script is sourced.

- Added aliases h='fc -l' and j='jobs'.

- Added the wrapper function for `doas` in an attempt to remove the

misleading terminal title.

## Yash 2.57 (2024-08-04)

- Added support for the "$POST_PROMPT_COMMAND" variable, whose value

is executed after reading a command line in the interactive shell.

- If the shell exits because of a shell error during the EXIT trap,

the shell now returns the exit status of the error rather than that

of the last command before the EXIT trap.

- [line-editing] Fixed the spurious error message printed when

completing after `git config alias.` with the nounset shell option

enabled.

- [line-editing] Completion no longer inserts a redundant backslash

to escape a character included in the completed word

when the cursor follows another backslash.

- Updated the sample initialization script (yashrc):

- Added setup for VS Code shell integration.

## Yash 2.56.1 (2024-03-20)

- The shell can now open more file descriptors on Cygwin.

- Fixed the bug where the "typeset -fp" built-in prints parameter

expansions of the form `${foo:/bar/baz}` with a redundant `#` flag

like `${foo:/#bar/baz}`.

- Fixed the bug where the `emacs-capitalize-word` line-editing

command misbehaves and possibly crashes the shell if there is no

word following the cursor to be capitalized.

- Added the `emacs-search-forward-current` and

`emacs-search-backward-current` line-editing commands.

- [line-editing] Added the completion script for `doas`.

======================================================================

Legend:

+: new feature

-: removed feature

=: specification change

*: bug fix

x: new bug

----------------------------------------------------------------------

Yash 2.55 (2023-08-20)

+ [line-editing] The Enter/Send key ("\et") now has a default

binding to the command the Ctrl-M key ("\^M") is bound to in each

mode.

= [line-editing] The redraw-all and clear-and-redraw-all commands

now can be used with an argument to swap their behavior.

* Fixed mistranslation in the Japanese language support.

. Updated the sample initialization script (yashrc):

+ Code example for binding Ctrl-L to clear-and-redraw-all.

. Updated completion scripts:

+ Completion for git-switch and pass

----------------------------------------------------------------------

Yash 2.54 (2023-02-25)

+ Changing font style of command line predictions with $PS1P, etc.

+ The '--le-trim-right' option.

= When the POSIXly-correct mode is active, the shell now refuses to

execute built-ins POSIX XCU 2.9.1 lists as utilities that cause

unspecified results. To implement the new behavior, the previous

"semi-special" built-ins are now categorized in either of the new

categories "mandatory" and "elective". The "command" and "type"

built-ins now report the new categories of such built-ins.

= The shell now requires a corresponding external executable to

exist in $PATH when running a built-in that works like a standard

external utility even when the POSIXly-correct mode is inactive.

Such built-ins are now categorized as "substitutive" built-ins.

= The "array" built-in is now completely ignored in the POSIXly-

correct mode. The built-in, formerly a regular built-in, is now

categorized as an "extension" built-in.

= The xtrace option is now ignored while expanding the $PS4

variable to prevent possible infinite recursion.

* The allexport option was wrongly ignored in many assignment

contexts.

* The errexit and errreturn options now work for assignment error

in a for loop.

* The ">" redirection with the noclobber option no longer hangs

when the operand names a symbolic link to a non-existing file.

* The exported value of the $DIRSTACK variable was not being

updated correctly in the "pushd" and "popd" built-ins.

* The effect of "!" no longer applies to the exit status of the

"break", "continue", and "return" built-ins.

* An alias value ending with a blank followed by a line

continuation no longer subjects the next token to alias

substitution.

. Updated the sample initialization script (yashrc):

+ The "o" alias for WSL

----------------------------------------------------------------------

Yash 2.53 (2022-08-23)

= The shell now deterministically rejects arithmetic expansions

that result in undefined behavior.

* A non-interactive yash now exits on an assignment error in a for

loop.

* Fixed a bug where command substitutions contained in the regular

expression inside the "[[ word =~ regex ]]" syntax were not

parsed correctly.

* Fixed a bug where unclosed quotes in an end-of-here-document

indicator were causing the shell to crash or misbehave.

* Fixed a bug where yash crashes when invoked with no argv.

----------------------------------------------------------------------

Yash 2.52 (2021-10-11)

= Unquoted multiple empty fields resulting from a single word

expansion are now removed. For example, the brace expansion {,}

now expands to no fields rather than two empty fields.

* In word expansion, if a field consists of a single non-whitespace

IFS character, it results in an empty field rather than no field.

* "typeset -fp" now correctly distinguishes "<<-FOO" and "<< -FOO".

* Fixed possible memory leak caused by improper use of the realloc

function.

. Updated completion scripts:

* git: Fixed completion of arguments in a command line containing

argument-taking options such as "-C".

----------------------------------------------------------------------

Yash 2.51 (2020-12-12)

= When an expansion error occurs, the shell now immediately stops

expansion rather than trying to expand the remaining part of the

word.

= When there are no positional parameters, "$@""$@" now expands to

nothing rather than one empty field, as defined in POSIX.

= Quote removal in arithmetic expansion has been modified to match

the behavior defined in POSIX. It no longer allows things like

$(("2" + \5)).

= The quotation rules for the substitution word in a parameter

expansion inside double-quotes have been changed to match with

the behavior of other existing shells. For example, "${x-\a'b'}"

now expands to \a'b' rather than ab.

= When there is no command word in a simple command, redirections

are now performed in a subshell after assignments are performed.

= The standard input of asynchronous commands in a non-job-control

shell is now always implicitly redirected to /dev/null,

regardless of whether the standard input has already been

redirected.

= Quoted characters are now handled in (almost) the same way as

Bash in the regular expression in the "[[ word =~ regex ]]"

syntax.

* The "command" built-in with the -v or -V option was printing

the pathnames of external commands with a redundant leading slash

when the current working directory is "/" or "//".

* Redirections on a subshell command are now evaluated in the

current shell rather than in the subshell.

* When an EXIT trap is executed in a subshell with a redirection,

the redirection was incorrectly not being applied to the trap.

* When job control is off, the "trap" built-in was failing to set

a new trap for SIGINT and SIGQUIT in an asynchronous command.

* When job control is off, SIGINT and SIGQUIT were not being

ignored if a trap had been set for the signal the main shell

process.

* In pattern matching, when an unescaped backslash results from an

expansion in the pattern, it is now treated as an escape

character.

* When there are no positional parameters, the nested expansion

"${{@}}" now expands to nothing rather than one empty field.

* Unquoted parentheses and vertical bars now can be used in the

regular expression in the "[[ word =~ regex ]]" syntax.

----------------------------------------------------------------------

Yash 2.50 (2020-05-31)

* With the "-o notify" option enabled, the "fg" built-in was

redundantly reporting the status of the job that had been resumed

and exited.

* Line-editing no longer hangs when the terminfo database maps a

key to an empty string.

* When $LINENO is exported, external commands now receive the

correct value of the variable.

. Updated the sample initialization script (yashrc):

+ A wrapper function for the "crontab" command is now installed

to prevent accidental removal by "crontab -r" where the user

intends "crontab -e".

. Updated completion scripts:

+ git-rebase: support new options in Git 2.24.0.

----------------------------------------------------------------------

Yash 2.49 (2019-09-22)

+ '--for-local' option.

= The '--no-unset' option now rejects unset variables not only in

parameter expansion but also in arithmetic expansion.

* Expansion of ""$*, ""$@, $*"", and $@"" now correctly yields an

empty string rather than nothing when there are no positional

parameters.

* The $RANDOM variable was expanding to a value larger than 32767

on some systems.

* The "\e" escape sequence was not working in the "echo" built-in.

* When a last command is a subshell, the parent shell's jobs were

not being cleared when entering the subshell.

* The job status was not being updated correctly if a process ID

was reused by another process before the previous process was

removed from the job list.

* The "typeset" built-in now prints functions that contain a simple

command whose command name is a keyword in a format that can

successfully re-parsed by the shell.

. Updated completion scripts:

* Remote branch names are now correctly completed for the

argument to Git remote/fetch/pull/push commands.

* Local pathname operands are now correctly completed for the

rsync command.

----------------------------------------------------------------------

Yash 2.48 (2018-12-22)

+ The double-bracket command (the [[ ... ]] syntax)

+ The "local" built-in

+ The '--le-predict-empty' option

+ The prompt string now can be defined with the $YASH_PS...

variables.

= Command line prediction no longer shows suggestion before you

start typing a command. Use the new '--le-predict-empty' option

to restore the previous behavior.

= The default value of $PS1 has been changed.

* The line number is now correctly counted in arithmetic

expansions that contain newlines.

* Subshells in the EXIT trap were unexpectedly exiting with the

exit status of the last command executed before the EXIT trap on

the main shell.

* A new EXIT trap that was set in a subshell in the EXIT trap was

unexpectedly being ignored.

* The "typeset" built-in was crashing when printing a function that

contains a here-document that contains a command substitution

that contains more than one command.

* The "typeset" built-in was forgetting to print here-document

contents when printing a function that contains a process

substitution (or redirection) that contains here-documents.

* The variable name token in the for command and the word following

a here-document redirection operator are now correctly parsed

even when it resulted from an alias substitution whose value

begins with a blank.

* The "do" keyword in a for loop is no longer subject to alias

substitution.

* An invalid semicolon that appears at the beginning of a line as a

result of alias substitution in a for loop is now correctly

rejected.

. For more strict POSIXly-correctness, some syntactic constructions

are now regarded as an error in the POSIXly-correct mode:

* An IO_NUMBER token cannot be the operand of a redirection.

* Keywords immediately following a redirection are not

recognized.

. Updated the sample initialization script (yashrc):

= The prompt strings are now defined with the $YASH_PS...

variables.

* Window title update should now work on more terminals.

* Any predefined handlers for SIGTSTP, SIGTTIN, and SIGTTOU are

now cancelled so that jobs can be suspended properly.

. Updated completion scripts:

* git: pathnames are now correctly completed with the latest Git.

+ git-grep: support new options in Git 2.19.1.

+ git-stash: support new options in Git 2.18.0.

+ ping: support some common options

= ssh, ssh-keygen: support new options in OpenSSH 7.7.

----------------------------------------------------------------------

Yash 2.47 (2018-04-11)

+ '--errreturn' option.

= Expansion results printed by the -x option is now quoted to

disambiguate presence of special characters.

= When the shell prints aliases, variables, key bindings, etc. they

are now printed with less quotes.

* The "set" built-in without any argument now prints not only local

variables but also global.

* The "." built-in no longer leaves temporary positional parameters

after a file-not-found error.

* The ">" redirection with the noclobber option is now more

reliable than before. Previously, there was little possibility of

overwriting an existing regular file in case another process

simultaneously replaces the file.

. Updated the sample initialization script (yashrc):

+ Example code for enabling "direnv".

----------------------------------------------------------------------

Yash 2.46 (2017-10-28)

= Global aliases are now substituted in all locations, including

part of compound commands where only operators are syntactically

acceptable.

* The shell now reads and executes all shell commands line by line.

Previously, commands that are not from a file or the standard

input were parsed all at once before being executed.

* After alias substitution where the alias value ends with a blank,

the next word is also subject to alias substitution, but

previously this substitution was being applied only once, which

was a different behavior from many other shells.

* After alias substitution where the alias value ends with a blank,

global aliases were being applied twice, which is now just once.

* Line continuations no longer prevent recursive alias

substitution.

----------------------------------------------------------------------

Yash 2.45 (2017-07-05)

+ [line-editing] new line-editing commands:

complete-max-then-list, complete-max-then-next-candidate,

complete-max-then-prev-candidate

= In prompt strings $PS1 and $PS2, the job count printed by the \j

notation included finished jobs that have not yet waited for.

That was confusing, so the job count no longer includes finished

jobs that have once had its "Done" status reported to the user.

= The "jobs" built-in, with the -n option, no longer clears

finished jobs that are not being reported.

* In arithmetic expansion, unset variables now successfully expand

to a value of "0".

* With the "-o notify" option, job status change was not being

printed until the shell receives a SIGCHLD.

. Updated the default initialization script (yashrc):

+ Confirm before clearing the whole history by "history -c'.

. Updated completion scripts:

+ carthage: --cache-builds option

* git: at most 10 candidates are now proposed for a commit hash.

----------------------------------------------------------------------

Yash 2.44 (2017-01-17)

+ Command line prediction and the '--le-predict' option.

+ A default initialization script is automatically loaded if the

~/.yashrc file cannot be loaded.

= During shell startup, $YASH_LOADPATH is now initialized only if

not set in the environment.

* Updated completion script for: carthage, git, git-log,

git-revert, git-submodule, ssh

* The "return" built-in was wrongly refusing to return from a

script sourced by the "." built-in in an interactive shell.

* In the "test" built-in, the unary "-o" operator was returning the

wrong answer if the given option name was negated with the "no"

prefix (e.g. "test -o noclobber").

* The "wait" built-in now returns an exit status of 1 if any

operand is invalid, ignoring results for any other operands.

* In a for loop without the "in" keyword, a semicolon that delimits

the variable name, if any, now must appear on the same line as

the variable name.

= Support for POSIX.1-2008 Technical Corrigendum 2 (2016).

This affects the shell's behavior only in the POSIXly-correct

mode unless marked with (*) in the following:

. In a pipeline, the reserved word "!" must now be delimited by

a white space when followed by a parenthesis "(".

. In a for loop without the "in" keyword, the variable name and

the "do" keyword can now be separated by a semicolon.

. Variables that are assigned in a simple command whose command

is a function no longer persist after the function finishes.

. The standard input of an asynchronous command is now implicitly

redirected to /dev/null when job control is off. Previously,

this was done when the shell was interactive in the POSIXly-

correct mode.

. The SIGINT and SIGQUIT signals on an asynchronous command are

now ignored only when job control is off.

. The "bindkey", "complete", "dirs", "disown", "hash", "help",

"history", "popd", "pushd", "suspend", "type", "typeset", and

"ulimit" built-ins are now semi-special built-ins.

. The "break" and "continue" built-ins now interrupt lexically

enclosing loops only. (*)

. Unquoted $* and $@ now expand to separate positional

parameters, even if $IFS is an empty string. (*)

. On an assignment error, a non-interactive shell now always

exits, regardless of command type. (*)

. When any error occurs in a special built-in in non-interactive

shell, the shell now exits, regardless of error type.

----------------------------------------------------------------------

Yash 2.43 (2016-09-22)

* Updated completion script for: carthage, cd, su

----------------------------------------------------------------------

Yash 2.42 (2016-08-27)

+ '--pipefail' option.

+ New completion script for: carthage, dnf, git-rev-parse, tree,

watch

+ Updated completion script for: cd, git, git-bisect, git-rev-list

(Git 2.9.2).

= Yash now supports the 2013 edition of POSIX.1-2008.

= Unclosed here-documents are now always rejected.

= A job-control shell now ignores SIGTTIN and SIGTTOU by default.

= Line-editing can now be interrupted by SIGINT.

= The "-o errexit" option is now applied to redirection errors on

compound commands and expansion errors in the for and case

commands.

* In backquoted command substitutions that occur in double quotes,

backslashes that escape a double quote are now handled before the

containing command is parsed.

----------------------------------------------------------------------

Yash 2.41 (2016-03-20)

+ '--emptylastfield' option.

+ New option for the "shift" built-in: -A

+ The "shift" built-in now accepts negative counts.

+ New completion script for: git-notes, git-reflog, git-worktree

= The non-interactive shell now exits on an assignment error

in a simple command without a command name.

= The exit status is now non-zero when a for loop has been

interrupted because of an read-only variable.

= When there is no positional parameter, the word """$@" is now

expanded to an empty word, producing the same result as "$@""".

= The behavior of field splitting has been modified to match the

intended interpretation of POSIX: If field splitting yields more

than one field and the last field is empty, the last field is now

removed.

= The "read" built-in now removes leading whitespaces when

assigning the last input value to the variable.

= The first character of $IFS is now always used as a separator

when concatenating positional parameters. Previously, $IFS was

ignored in some corner cases.

* Unclosed process redirections are now detected as syntax error.

* When $ECHO_STYLE was GNU or ZSH, the "echo" built-in was

incorrectly ignoring single hyphen operands.

* The "typeset" built-in was crashing when used with a temporary

assignment to a variable not specified in the built-in operands.

* In the "typeset" built-in, the -r option was not effective when

printing functions.

* The "typeset" built-in now detects combination of the -f and -g

options as an error.

* The "fg" and "bg" built-ins no longer try to resume a non-job-

controlled job when given no operand.

* In range brace expansion, integers were not always parsed

correctly.

* The "fc" built-in was not handling the history range correctly

when the range was specified with an unused entry number.

* The "fc" built-in was incorrectly rejecting the syntax of the

form "fc -s foo=bar n".

* The interactive shell was unexpectedly forgetting the exit status

of background jobs when reporting the job status.

* Fixed potential undefined behavior during reading a history file.

* Parameter expansions of the form ${foo/bar/baz} are now rejected

in the POSIXly-correct mode, as documented in the manual.

* Single- or double-quoted empty words were incorrectly being

removed in field splitting.

* Backslash escapes are now recognized in parameter indexes.

----------------------------------------------------------------------

Yash 2.40 (2016-01-09)

= The "unset" built-in no longer rejects variable names containing

the "=" symbol as an error. They are now silently ignored.

= In the POSIXly-correct mode, unclosed here-documents are now

treated as an error.

* Fixed possible arithmetic overflow errors in memory allocation

which might result in an undefined behavior.

* Fixed crash on assigning a floating-point number in arithmetic

expansion.

* Fixed memory leak on finding a command in a relative path from

$PATH.

* The parameter expansion ${foo##bar*} was being treated like

${foo##bar} where the asterisk should match up to the end of the

parameter value.

* The parameter expansion ${foo%%*} was being expanded to ${foo}

where it should expand to an empty string.

* The "getopts" built-in no longer rejects digits as option

characters.

* The non-interactive shell no longer exits when the "command"

built-in executes the "." built-in and the script is not found.

* Fixed incorrect exit status of simple commands where command

substitution is performed during command word expansion which

yields no command line words.

* The "exec" built-in now correctly exits with an exit status of

127 for a script file not found.

* Pipes were not being connected as expected during command word

expansion.

* The "fg" and "bg" built-ins now report an error when they fail to

print the job name.

----------------------------------------------------------------------

Yash 2.39 (2015-08-27)

+ New options for the "read" built-in: -e, -P, -p

+ New completion script for: passwd, valgrind

- The configuration option '--disable-alias' has been dropped.

= The "read" built-in now requires the -e (--line-editing) option

to enable line-editing.

= The behavior of the "trap" built-in now conforms to POSIX.1-2013.

The built-in prints the traps for the calling shell rather than

the subshell when it is executed in a command substitution.

= The manual for the "return" built-in has been clarified as to

what the built-in can return from. The behavior of the built-in

has been modified accordingly. It no longer interrupts the "eval"

and "fc" built-ins.

* Crash on division by zero with the "/=" or "%=" operator

in arithmetic expansion.

* Crash in the "complete" built-in called without the -D option.

* Yash no longer tries to find the profile and rcfile scripts in

the root directory when $HOME is not set.

* The "read" built-in with a single operand was failing to trim

initial IFS whitespaces in field splitting.

* The "read" built-in was not handling backslashes correctly in

field splitting if $IFS contained a backslash.

* The "-o allexport" option was being ignored when an array is

assigned by the "read" built-in with the -A option.

* Traps are no longer handled while waiting for input with line-

editing in the "read" built-in.

* Operands to the "set" built-in are now correctly completed.

* Minor fix in completion script for "git-svn".

----------------------------------------------------------------------

Yash 2.38 (2015-06-21)

+ New completion scripts for: git-rm

= In the POSIXly-correct mode, functions must now be defined with a

portable name.

* Backslashes following IFS characters were wrongly being dropped

in field splitting.

* In the POSIXly-correct mode, non-portable variable names are no

longer allowed in for loops.

* Completion error on words following a tilde expansion.

* Completion error on moved or copied tracked files for git-add and

git-commit.

* Completion error on untracked file for git-commit.

----------------------------------------------------------------------

Yash 2.37 (2015-01-25)

+ Updated completion scripts for:

git-checkout (Git 2.1.2), git-push (Git 2.0.1), git-submodule

(Git 2.1.2).

----------------------------------------------------------------------

Yash 2.36 (2014-04-06)

+ New completion scripts for: git-describe, tig.

+ Updated completion script for: git-branch (Git 1.9.0).

----------------------------------------------------------------------

Yash 2.35 (2013-06-08)

+ '--traceall' option.

+ New completion scripts for:

git-clean, git-grep, git-ls-remote, git-submodule,

git-whatchanged

+ Updated completion scripts for:

git-cherry-pick, git-rebase (Git 1.8.1.4),

ssh, ssh-add, ssh-keygen (OpenSSH 6.2)

= The condition for exiting the shell when the -e option is enabled

has been changed in accordance with the 2013 edition of

POSIX.1-2008.

= The "++" and "--" operators are no longer supported in the

POSIXly-correct mode.

= The $RANDOM variable now always returns random numbers, ignoring

the value from the environment variable, if any.

= If yash encounters a too long line that cannot be handled while

reading a history file, it now tries to keep reading the rest of

the file rather than stopping reading.

= Very long command lines are no longer saved in the history file.

* Minor fix in a syntax error message.

* Minor fix in completion script for "git", "ssh" and "rsync".

----------------------------------------------------------------------

Yash 2.34 (2013-02-23)

+ New "test" built-in operator: =~, -o (unary)

+ New completion scripts for:

configure, git-name-rev, git-request-pull, make, rsync

= A syntax error or expansion error in .yash_profile or .yashrc

no longer makes the shell exit even when the shell is not

interactive.

= In line-editing, overwritten characters are now restored when you

hit the backspace key.

= In line-editing, the undo history is no longer saved for each

backspace.

* Fixes in completion scripts for "git".

----------------------------------------------------------------------

Yash 2.33 (2012-10-27)

= The "help" built-in now prints brief usage of built-ins.

= Some error messages for command syntax error have been revised.

= Some built-ins now check command syntax more strictly.

* The "set" built-in aborts the shell on a command syntax error

as specified in POSIX.

----------------------------------------------------------------------

Yash 2.32 (2012-09-22)

+ Man page and HTML manual in English and Japanese.

= The "help" built-in now prints part of the man page.

* Fixes in completion scripts for "git".

----------------------------------------------------------------------

Yash 2.31 (2012-06-24)

+ Completion of directory stack indices in extended tilde

expansion.

+ New option for the "complete" built-in: --dirstack-index

+ Completion for "svn" version 1.7.

* Fixes in "git", "tar" and "su" completion scripts.

----------------------------------------------------------------------

Yash 2.30 (2012-02-04)

* Fixed pathname completion for redirections.

+ New completion scripts for:

svn, git, gitg, gitk, and gitx.

* Minor fixes in completion scripts.

----------------------------------------------------------------------

Yash 2.29 (2011-10-15)

+ An alias value now can contain newlines.

* Fixed invalid memory access on printing an empty array using the

"typeset" built-in.

* The function body is now correctly executed in a subshell when

the body is defined using the (...) compound command.

* In line-editing, the undo command can now be applied only to the

history entry that is being edited.

----------------------------------------------------------------------

Yash 2.28 (2011-08-20)

= In an interactive shell, mail check is now done before job status

report.

* Fixed arithmetic expansion evaluating some expressions that

should not be evaluated.

* Fixed the "array" built-in removing the wrong elements when

positive and negative indices are intermixed with the -d option.

* Fixed the EXIT trap being wrongly executed after a command-not-

found error.

* The EXIT trap is now executed with the correct redirection when

the last command had redirection.

* The "exec" built-in now correctly exports arrays that are just

assigned.

* ${#@} is now correctly expanded to an array of integers that

represent the lengths of array elements.

* Fixed infinite loop in sequential brace expansion.

* Fixed configuration file parsing in completion of the "ssh"

command.

* The "-T" option of the "ln" and "mv" commands now can be

completed.

* The EXIT trap now can be completed.

----------------------------------------------------------------------

Yash 2.27 (2011-05-16)

* Minor bug fixes.

+ New completion scripts for:

awk, chsh, gawk, nawk, pgawk, scp, sftp, ssh-add, ssh-agent,

ssh-keygen, su, sudo, sudoedit, and useradd.

* Fix in completion scripts for the "set" and "tar" commands.

----------------------------------------------------------------------

Yash 2.26 (2011-02-17)

+ New option for the "return" built-in: -n (--no-return)

= Error messages have been revised.

= Shell option names have been generalized: Option names are now

case-insensitive. Non-alphanumeric characters are ignored in

option names. Options can be inverted by prefixing "no" to

their names.

= "case foo in (esac) bar; esac" is now rejected in the POSIXly

correct mode.

= The "-o noexec" option is now ignored in an interactive shell.

= New mail notification is now printed only when the mailbox file

is not empty.

= "printf %c ''" now prints nothing as "printf %c" do.

= In an invocation of the "complete" built-in with the -A or -R

option, the pattern is now matched against the last component of

the pathname when generating pathname candidates with the -f

option.

* Function names containing an '=' sign can now be specified as

arguments to the typeset and unset built-ins (with the -f

option).

* Fixed the exit status of iterative execution that was interrupted

by SIGINT.

+ New completion scripts for:

bsdtar, eview, evim, gex, gnutar, gtar, return, rgview, rgvim,

rview, rvim, slogin, ssh, tar, and which.

* Many fixes in completion scripts for:

bash, chmod, dash, less, mksh, set, sh, and umask.

----------------------------------------------------------------------

Yash 2.25 (2010-11-21)

= In the completion candidate list, options are now sorted case-

insensitively.

= While executing a completion function, the $IFS is reset to the

default value.

+ New completion scripts for:

bash, csplit, dash, diff, ed, egrep, env, ex, expand, fgrep,

file, find, fold, getconf, grep, gview, gvim, gvimdiff, head,

iconv, id, join, ksh, less, ln, locale, man, mesg, mkdir, mkfifo,

mksh, more, mv, newgrp, nice, nl, nohup, od, paste, patch,

pathchk, pr, ps, renice, rm, rmdir, sed, sh, sort, split, stty,

tail, tee, time, touch, tr, uname, uniq, vi, view, vim, vimdiff,

wc, who, xargs, and yash.

* Many fixes in completion scripts for:

cat, cd, chgrp, chmod, chown, cmp, comm, cp, crontab, cut, date,

df, du, exec, ls, and set.

----------------------------------------------------------------------

Yash 2.24 (2010-10-03)

+ New option for the "." built-in: -L

+ New options for the "command" built-in: -a, -f, -k

- Removed the -B option for the "command" built-in.

= Fixed configuration process so that the shell can handle all

kinds of signals on FreeBSD.

= [line-editing] New command completion mechanism. The "complete"

built-in now has new syntax and semantics. Completion settings

are now autoloaded from $YASH_LOADPATH.

+ New completion scripts for:

basename, bg, cat, chgrp, chmod, chown, cmp, comm, command, cp,

crontab, cut, date, df, du, export, popd, pushd, readonly, type,

".", and "[".

= Revised completion scripts for:

alias, array, bindkey, break, cd, complete, continue, dirs,

disown, echo, eval, exec, exit, fc, fg, getopts, hash, help,

history, jobs, kill, ls, printf, pwd, read, set, suspend, test,

trap, typeset, ulimit, umask, unalias, unset, and wait.

- Removed completion script for the "return" built-in.

= Short options now come before long options in a completion

candidate list.

* Symbolic links to non-existent files can now be completed.

* Other fixes in command completion.

* Fixed invalid memory access on parameter expansion failure in

redirection.

----------------------------------------------------------------------

Yash 2.23 (2010-07-29)

* Traps are no longer handled during completion to avoid messing up

the display.

* Fixed invalid memory access during completion. When the notify

option is enabled, the shell was wrongly trying to notify the job

status while executing a candidate generator function.

* The "-o verbose" option is now disabled during completion to

suppress the auto-loaded script being printed.

* Fixed completion script for the "kill" built-in.

----------------------------------------------------------------------

Yash 2.22 (2010-07-25)

+ New "test" built-in operators: -G, -O, -N

+ Completion settings are now autoloaded from $YASH_COMPPATH.

+ New completion scripts for:

alias, array, bindkey, break, cd, complete, continue, dirs,

disown, echo, eval, exec, exit, fc, fg, getopts, hash, help,

history, jobs, kill, ls, printf, pwd, read, return, set, suspend,

test, trap, typeset, ulimit, umask, unalias, unset, and wait.

* Fix a bug that was causing a signal received by a just-created

subshell to be wrongly ignored.

* Other bug fixes

----------------------------------------------------------------------

Yash 2.21 (2010-06-18)

+ Command line completion

= In an interactive shell, the value of $LINENO is now reset to 1

every time a command is input and executed.

* The "function" keyword was not recognized by "command -v".

* Fixed handling of SIGINT so that the interactive shell properly

gets back to normal after receiving SIGINT.

* Input reading functions rewritten, including some bug fixes.

----------------------------------------------------------------------

Yash 2.20 (2010-05-16)

+ Function definition using the "function" keyword.

= The "-nt" and "-ot" operators of the "test" built-in now consider

a non-existent file older in favor of Korn shell.

= [line-editing] some editing commands have been renamed:

vi-change-all -> vi-change-line

vi-yank-and-change-all -> vi-yank-all-change-line

vi-append-end -> vi-append-to-eol

* [line-editing] the clear-and-redraw-all command was broken.

----------------------------------------------------------------------

Yash 2.19 (2010-02-14)

+ The "ulimit" built-in is now available on FreeBSD.