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Full Discussion: Problems passing shell arguments to perl
Top Forums Shell Programming and Scripting Problems passing shell arguments to perl Post 302887124 by johnny_canucl on Wednesday 5th of February 2014 08:55:43 PM
Old 02-05-2014
Question Problems passing shell arguments to perl
Semi-newbie, so flame throwers to 'singe-only', please. ;-)

I have a large number of (say) .html files, where I'd like to do a recursive in-place search and replace a particular string. The following bit of perl works fine:

Code:
perl -pi -e 's/oldstring/newstring/g' `find ./ -name *.html`

But, I can never remember the specific commends (getting old), so I generally dump this sort of thing into a script. Say, a bash script. But, I'm having a heck of a time getting the script to take command line args and pass them to the perl script. Imagine said script is called replace_string

Suppose I want to change the occurrence of 2013 to 2014. What I want to be able to do is type

> replace_string 2013 2014

So in my bash script, I've tried the following:

Code:
#!/bin/bash
echo "target string -- $1"
echo "new string -- $2"
perl -pi -e 's/$1/$2/g' `find ./ -name *.html`

But, this doesn't work. I've tried putting double-quotes around $1 and $2, but..nada.

I'm guessing this is a simple no-brainer sort of thing, but I haven't sussed it out yet. Pointers to the obvious appreciated.

(Note: I've no doubt there are other ways to do the inplace search and replace, but that isn't the point here -- the problem is general -- passing bash shell comand args to a perl function)
 

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LEARN ABOUT DEBIAN

string::shellquote

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

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 v5.8.4							    2005-05-03							   ShellQuote(3pm)
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