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Full Discussion: Cannot execute Unix command in a simple perl script
Top Forums Shell Programming and Scripting Cannot execute Unix command in a simple perl script Post 302558456 by Corona688 on Friday 23rd of September 2011 03:12:47 PM
Old 09-23-2011
[edit] think we crossposted. I still need the -v one though!

---------- Post updated at 01:12 PM ---------- Previous update was at 01:09 PM ----------

Quote:
I have already tested this with shell script and works fine. but i just want to know why the same unix command gives the same result as executed in a shell script
Because, as already explained, this isn't a shell script, this is shell script inside perl, and things are being substituted inside perl before the shell even gets to it.

You can see the same problem in shell code:

Code:
$ NF=slartibartfast
$ echo '{ $NF }'
{ $NF }
$ echo "'{ $NF }'"
{ slartibartfast }
$

If you wanted the literal string $NF, double quotes won't cut it, even if you single quote things inside double quotes.

I'll work on a solution for you. (still need the -v output)
Last edited by Corona688; 09-23-2011 at 04:17 PM..
 

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LEARN ABOUT CENTOS

string::shellquote

ShellQuote(3)						User Contributed Perl Documentation					     ShellQuote(3)

NAME

       String::ShellQuote - quote strings for passing through the shell

SYNOPSIS

	   $string = shell_quote @list;
	   $string = shell_quote_best_effort @list;
	   $string = shell_comment_quote $string;

DESCRIPTION

       This module contains some functions which are useful for quoting strings which are going to pass through the shell or a shell-like object.

       shell_quote [string]...
	   shell_quote quotes strings so they can be passed through the shell.	Each string is quoted so that the shell will pass it along as a
	   single argument and without further interpretation.	If no strings are given an empty string is returned.

	   If any string can't be safely quoted shell_quote will croak.

       shell_quote_best_effort [string]...
	   This is like shell_quote, excpet if the string can't be safely quoted it does the best it can and returns the result, instead of dying.

       shell_comment_quote [string]
	   shell_comment_quote quotes the string so that it can safely be included in a shell-style comment (the current algorithm is that a sharp
	   character is placed after any newlines in the string).

	   This routine might be changed to accept multiple string arguments in the future.  I haven't done this yet because I'm not sure if the
	   strings should be joined with blanks ($") or nothing ($,).  Cast your vote today!  Be sure to justify your answer.

EXAMPLES

	   $cmd = 'fuser 2>/dev/null ' . shell_quote @files;
	   @pids = split ' ', `$cmd`;

	   print CFG "# Configured by: ",
		       shell_comment_quote($ENV{LOGNAME}), "
";

BUGS

       Only Bourne shell quoting is supported.	I'd like to add other shells (particularly cmd.exe), but I'm not familiar with them.  It would be
       a big help if somebody supplied the details.

AUTHOR

       Roderick Schertler <roderick@argon.org>

SEE ALSO

       perl(1).

perl v5.16.3							    2010-06-11							     ShellQuote(3)
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