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In bash shell with emacs key-binding, you can use key combination like M-f, M-b to move one word forward or backward on the shell prompt respectively. Usually, the meta key is mapped to Alt key on Windows and Linux. However, in iTerm, I could not find a way to map this meta key to either Option or Command key on my MacBook Pro.

It seems that in OS X, the meta key is by default mapped to ESC key. So you can use ESC-f, ESC-b on iTerm. However, ESC key is apparently not practical to use. In addition, iTerm does have option that allow you to modifier mapping for the meta key (Bookmarks > Profiles > Keyboard Profiles > Global > Option Key as...), this setting does not seem to work at all.

Therefore, if anyone know what is the solution to this problem, please let me know.

I have upgraded to the latest release, 0.9.6.1012, and this behavior is still persist.

Edit: Some clarification to my question. The key-binding I'm talking about is for bash shell, not in emacs. It just happens that, by default, bash shell also use the same key-binding as emacs.

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  • 1
    After messing with this issue for a while and cannot figure out a solution. I gave up and switched to Terminal now. Commented Oct 22, 2008 at 19:51
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    don't forget that iterm2 already exists and everything is fine in there=) Commented Feb 10, 2011 at 1:33
  • 1
    Even with iterm2, from a fresh install 2021-May, on a Mac one still needs to remap left/right option to act as "+Esc" rather than "Normal" Commented May 28, 2021 at 18:01

16 Answers 16

Reset to default
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  1. Open "Preferences" (⌘,) -> Profiles -> Keys -> General tab.
  2. Set Left Option key: to act as Esc+.

Works for me in Emacs, though I'm not sure if it will have any other undesirable effects.

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8 Comments

I did try Option Key as... with all choices but none of them works for me in bash shell. It only shows "?" every time I press the meta key combination.
It looks like your input language has to be U.S. for the +ESC option to work. +ESC didn't work for me when I had the Japanese/Romaji input method selected, but it started to work once I switched the input language to U.S.
Preferences, Profile, Keys and choose Left option Key acts as: +Esc. Then you will have both left option key AND Esc key as meta key. That is what happened in my case.
With iTerm 2 this seems to be the recommended option.
For my external keyboard I had to set both left and right option keys to use Esc+, even though I was using the left option key it would still print weird characters. This might happen because I use the Keyboard Modifiers option in Mac Keyboard settings to change the keys.
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132

Go to Bookmarks > Manage Profiles. Then select Keyboard Profiles > Global and choose Option Key as Meta. This works for me in version 0.9.6.1201.

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5 Comments

I had to change the xterm (OS X) entry rather than global, but it is working now.
I don't know why on my machine the setting is broken on 0.9.6.1201 and several other builds I tried. It works, however, with the latest 0.9.6 build and 0.10 though. So it shouldn't be an issue now.
in iTerm2 this worked only after I re-defined the Profile Shortcut Keys for alt+-> and alt+<- to Send Escape Sequence + f/b respectively.
I had to open a new iterm session for it to kick in
@SridharRatnakumar Works for iTerm too
43

For iTerm2 users this answer just partially solves the problem.

Cmd+., Profiles, Keys and choose Left option Key acts as: +Esc.

In addition to that, you have to go to Preferences (Cmd+,) ➔ Profiles ➔ Keys and in the Key Mappings find these Key Combination's: enter image description here and enter image description here. Double click on each mapping and change their Action and Esc+ to the following:

enter image description here

enter image description here

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4 Comments

for some reason I have to press CMD + ALT + -> .... in my app with that..
@nicolas this thread is for macos
This is the suggestion that solved it for me
This worked for me. I did not have these keyboard shortcuts in my settings, however. I had ot add them.
38

In Menu bar Iterm2 => Preferences => Profiles choose the keys tab and select

left Option key act as +Esc

enter image description here

worked for me as well in irssi.

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3 Comments

Excellent, this also works in the combination of iTerm2 + tmux
In my case, left and right were swapped, I had set the Right option to Esc+ for the button at the left of my keyboard to work (Using an external keyboard)
@Adam — wish I'd seen your comment an hour ago! :) Same issue here.
18

Go to your iTerm preferences select "profiles" then "key" and change your presets in "Natural Text Editing"

iTerm Preferences

It should work immediately after.

It works with iTerm version 3.3.12

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2 Comments

I used Terminal.app compatibility and it worked.
This is by far the simplest solution. No need to map specific keys or do +ESC
4

Going all zombie resurrection here, but for sake of posterity --

This post got it working as you desire for me, for M-b and M-f, while keeping 'Option Key as Meta' set so you don't sacrifice a modifier (I have vim mappings using meta, personally).

In summary, in your Global Keyboard Profile, add two new mappings with settings:

  1. Key as hex code, value of 62 for b, 66 for f (man ascii)
  2. Modifier as Option
  3. Action as send escape sequence, value b or f

The only thing I still miss from Terminal.app is Opt-Backspace to delete by word. There are other workarounds for that, but I'm just trying to train myself to use Ctrl-w.

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1 Comment

May be a new feature since this answer, but you can map a Global Key Shortcut to send Ctrl-w when Opt-Backspace is pressed.
4

It's easier in iTerm2. Go to preferences->bookmark->keyboard and select Option sends +ESC. In iTerm2 you can configure the left and right option keys separately, so remember to change both if that's what you want. Link for iTerm2: http://sites.google.com/site/iterm2home/

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3

Go to Bookmarks > Manage Profiles. Then select Keyboard Profiles > Global and choose Option Key as +ESC.

Works in iTerm Build 0.9.5.0611 & Build 0.9.6.20090415

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1 Comment

Hmm. The setting seems to be broken on my machine with these two versions as well. However, the latest 0.9.6.20090928 and 0.10 work as expected though.
2

I found some solution on stackoverflow also, just go to keyboard profile and in "Global" change "Option key as" +ESC

that works for me perfectly =) btw some iterm patch exists also look here: http://www.emacswiki.org/emacs/EmacsForMacOS

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2

On top of the Left/Right Option key: Esc+ setting mentioned in may answers, I had to also check this option: xterm control sequence can enable modifyOtherKeys mode.

This is in Iterm2 3.4.23.

enter image description here

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0

I don't know about iTerm, but you can do this in Terminal. Instructions can be found here:

Emacs on Mac OS X Leopard key bindings

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1 Comment

Thank you. I am aware that I can do that in Terminal. I just want to achieve the same result in iTerm. By the way, what I'm looking for is the key-binding in bash shell, not in emacs. It just happens that bash shell also uses emacs key binding.
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Here is what worked for me: Bookmarks > Manage Profiles > Keyboard Profiles > Global/xterm > Option Key as +Esc. With this, I can use Option+Enter in Midnight Commander and the currently selected file/directory name shows up in the command string, as it should. Option Key as Meta did not work for me. My build of iTerm is 0.10.

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0

I was struggling with Meta + Left or Meta + Right. The context was for keystroke in Emacs utilized in an iTerm2 session.

I tried Esc+ and Meta for the left Option key with no luck. I tried with and with out the hex mappings. No luck.

But then I tried "Report modifiers using CSI u". (Documentation here). That allowed me to use the meta + Left and meta + right keys in Emacs, which is the behavior I have on my Linux machine.

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0

The common answers of setting the options key to ESC+, didn't work for me out of the box. At some point I realized that it doesn't work only when opening the floating iterm terminal (using F12). The trick to fix it was setting the options key to ESC+ also for the "Hotkey Window" profile.

enter image description here

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0

This tiny note in the "Apps can change this" mouseover made all the difference for me:

enter image description here

After trying all the options above for what seemed like hours, it was as simple as setting the "Right Option key" to act as Esc+ (though I was pressing Left).

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-2

Try "export LANG=C". I'm not emacs expert, but I found this enables emacs on OS X to recognize the Option key as the Meta key in iTerm,

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