Re: [PLUG] Perl backticks/system question

["Paul W. Roach III" <paul@isaroach.com>]

I put together an example to show it:

 

[proach@tp ~]$ cat blah.pl
#!/usr/bin/perl

use strict;
use warnings;

my $input = join(" ", @ARGV);

print "input is: $input\n";

print "executing: echo $input\n";
my $output = `echo $input`;
print "$output";

exit;

[proach@tp ~]$ ./blah.pl this is a test
input is: this is a test
executing: echo this is a test
this is a test

[proach@tp ~]$ ./blah.pl this is a (test)
-bash: syntax error near unexpected token `('

[proach@tp ~]$ ./blah.pl this is a \(test\)
input is: this is a (test)
executing: echo this is a (test)
sh: -c: line 0: syntax error near unexpected token `('
sh: -c: line 0: `echo this is a (test)'
[proach@tp ~]$ ./blah.pl this is a \\(test\\)
-bash: syntax error near unexpected token `('

[proach@tp ~]$ ./blah.pl this is a \\\(test\\\)
input is: this is a \(test\)
executing: echo this is a \(test\)
this is a (test)
[proach@tp ~]$

On Nov 19, 2007 3:05 PM, Paul W. Roach III <paul@isaroach.com> wrote:

Often this can take many escapes to make it work.  I've seen the need to do things like:

 

\\\\(blah\\\\).

 

It sounds weak, but try adding \'s until you stop getting the error :)

 

It's really wacky, but I've seen perl scripts calling ssh via the shell on pipes and running remote commands -- you have to escape things like 6 times -- each intermediate shell strips off half of the \ chars.

 

-P

On Nov 19, 2007 2:31 PM, gabriel rosenkoetter <gr@eclipsed.net> wrote:

At 2007-11-19 11:08 -0500, lists@linuxnotes.net < lists@linuxnotes.net> wrote:
> 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 `('

It'd help to see the code, but I think that you need to escape the
parens.

(Remember characters that are special for Perl will be processed and
eaten within double-quotes and backticks when not escaped, but never
touched within single-quotes.)

--
gabriel rosenkoetter
gr@eclipsed.net

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