exec(cmdArray) to bash shell does not work

Re: exec(cmdArray) to bash shell does not work

First -- try using the full path for lp, i.e. "/usr/bin/lp" or similar
("which lp" should give you the full path). Interactive logins will set
a path potentially different from the path your "Runtime" call receives,
so Runtime may not have the path necessary to call just "lp".
-Matt

John Bowling wrote:[color=blue]
> I have a java (2.0) program with the following lines:
>
> String cmdArray1[] = {"lp", "-d", "hp4m", "MyFile"};
> System.out.prin tln(Runtime.get Runtime().exec( cmdArray1));
>
> It compliles properly, but does not print the file to the printer. It
> displays the following as the return from Runtime...:
>
> java.lang.UNIXP rocess@1034bb5
>
> It apparently is sending something out to bash and getting that result back.
>
> This in within SuSE 8.2 Linux running bash.
> The following line typed into the shell works properly:
> lp -d hp4m MyFile
>
> Anyone have any ideas?
> Thanks, John
>
>[/color]

Re: exec(cmdArray) to bash shell does not work

That solved the problem of printing the file.
If I specify the filename as "MyFile*", which could be handy when you have
multiple files that are similar but with a count, it will not find the file.
Currently I don't need to do that, but I probably will at some point.
Thanks, John

"Matt Smith" <matt.smith@uco nn.edu> wrote in message
news:3FA7F50A.6 000402@uconn.ed u...[color=blue]
> First -- try using the full path for lp, i.e. "/usr/bin/lp" or similar
> ("which lp" should give you the full path). Interactive logins will set
> a path potentially different from the path your "Runtime" call receives,
> so Runtime may not have the path necessary to call just "lp".
> -Matt
>
> John Bowling wrote:[color=green]
> > I have a java (2.0) program with the following lines:
> >
> > String cmdArray1[] = {"lp", "-d", "hp4m", "MyFile"};
> > System.out.prin tln(Runtime.get Runtime().exec( cmdArray1));
> >
> > It compliles properly, but does not print the file to the printer. It
> > displays the following as the return from Runtime...:
> >
> > java.lang.UNIXP rocess@1034bb5
> >
> > It apparently is sending something out to bash and getting that result[/color][/color]
back.[color=blue][color=green]
> >
> > This in within SuSE 8.2 Linux running bash.
> > The following line typed into the shell works properly:
> > lp -d hp4m MyFile
> >
> > Anyone have any ideas?
> > Thanks, John
> >
> >[/color]
>[/color]

Re: exec(cmdArray) to bash shell does not work

Wildcards are a shell function. I am not overly familiar with
"Runtime.ex ec", but my guess would be that the command is executed
directly by the system, not issued through a shell. If you really want
the shell features (like wildcarding), you may want to issue something
like this (with adjusted paths as needed):

"/bin/bash -c \"/usr/bin/lp -d hp4m MyFile*\" "

This forces the BASH shell to execute the command, and since the shell
is handling the command, shell functions like wildcards should work.

Note the escaped (\") quotes -- I believe (I may be wrong) that the -c
option for bash needs quotes around it's command string. Escape the
inner quotes with a backslash to make sure Java does not interpret them
as closing your string.

Hope that helps,
-Matt


John Bowling wrote:[color=blue]
> That solved the problem of printing the file.
> If I specify the filename as "MyFile*", which could be handy when you have
> multiple files that are similar but with a count, it will not find the file.
> Currently I don't need to do that, but I probably will at some point.
> Thanks, John
>
> "Matt Smith" <matt.smith@uco nn.edu> wrote in message
> news:3FA7F50A.6 000402@uconn.ed u...
>[color=green]
>>First -- try using the full path for lp, i.e. "/usr/bin/lp" or similar
>>("which lp" should give you the full path). Interactive logins will set
>>a path potentially different from the path your "Runtime" call receives,
>>so Runtime may not have the path necessary to call just "lp".
>>-Matt
>>
>>John Bowling wrote:
>>[color=darkred]
>>>I have a java (2.0) program with the following lines:
>>>
>>>String cmdArray1[] = {"lp", "-d", "hp4m", "MyFile"};
>>>System.out.p rintln(Runtime. getRuntime().ex ec(cmdArray1));
>>>
>>>It compliles properly, but does not print the file to the printer. It
>>>displays the following as the return from Runtime...:
>>>
>>>java.lang.UN IXProcess@1034b b5
>>>
>>>It apparently is sending something out to bash and getting that result[/color][/color]
>
> back.
>[color=green][color=darkred]
>>>This in within SuSE 8.2 Linux running bash.
>>>The following line typed into the shell works properly:
>>>lp -d hp4m MyFile
>>>
>>>Anyone have any ideas?
>>>Thanks, John
>>>
>>>[/color]
>>[/color]
>
>[/color]