| Walt Mankowski on 19 Nov 2007 17:28:24 -0000 |
|
On Mon, Nov 19, 2007 at 11:08:41AM -0500, lists@linuxnotes.net wrote:
> Hi all,
>
> I have a bash script that I need to run from within a Perl script and
> capture the output. My script works fine until it hits a parentheses in
> an argument and then I get:
>
> sh: -c: line 0: syntax error near unexpected token `('
>
> I understand that if there are arguments in backticks the command is sent
> to the shell for interpretation, but if I run the command outside of my
> Perl script it works fine so I am not sure where I am getting the error
> from. I have used quotemeta() to escape all the special characters.
When you execute a command with backticks from within perl, you might
think that perl just uses whatever shell it was started from, but
that's not what happens. Instead, perl uses the default shell it
found when it was being configured on your system. Normally this is
/bin/sh. You can see what your perl is using with the command
% perl -MConfig -le 'print $Config{sh}'
My guess is that /bin/sh is linked to bash (which gives the error
message you posted), while you're using some other shell (perhaps
ksh?). On many shells (e.g. bash, zsh, and csh) parens are special
characters that do some sort of expansion, but on your shell they're
not. I can think of several workarounds, but the solution you've
found (quotemeta) seems as easy as anything else.
Walt
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