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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 MOJAVE

module::load

Module::Load(3pm)					 Perl Programmers Reference Guide					 Module::Load(3pm)

NAME

       Module::Load - runtime require of both modules and files

SYNOPSIS

	       use Module::Load;

	   my $module = 'Data:Dumper';
	   load Data::Dumper;	   # loads that module
	   load 'Data::Dumper';    # ditto
	   load $module 	   # tritto

	   my $script = 'some/script.pl'
	   load $script;
	   load 'some/script.pl';      # use quotes because of punctuations

	   load thing;		   # try 'thing' first, then 'thing.pm'

	   load CGI, ':standard'   # like 'use CGI qw[:standard]'

DESCRIPTION

       "load" eliminates the need to know whether you are trying to require either a file or a module.

       If you consult "perldoc -f require" you will see that "require" will behave differently when given a bareword or a string.

       In the case of a string, "require" assumes you are wanting to load a file. But in the case of a bareword, it assumes you mean a module.

       This gives nasty overhead when you are trying to dynamically require modules at runtime, since you will need to change the module notation
       ("Acme::Comment") to a file notation fitting the particular platform you are on.

       "load" eliminates the need for this overhead and will just DWYM.

Rules
       "load" has the following rules to decide what it thinks you want:

       o   If the argument has any characters in it other than those matching "w", ":" or "'", it must be a file

       o   If the argument matches only "[w:']", it must be a module

       o   If the argument matches only "w", it could either be a module or a file. We will try to find "file.pm" first in @INC and if that
	   fails, we will try to find "file" in @INC.  If both fail, we die with the respective error messages.

Caveats
       Because of a bug in perl (#19213), at least in version 5.6.1, we have to hardcode the path separator for a require on Win32 to be "/", like
       on Unix rather than the Win32 "". Otherwise perl will not read its own %INC accurately double load files if they are required again, or in
       the worst case, core dump.

       "Module::Load" cannot do implicit imports, only explicit imports.  (in other words, you always have to specify explicitly what you wish to
       import from a module, even if the functions are in that modules' @EXPORT)

ACKNOWLEDGEMENTS

       Thanks to Jonas B. Nielsen for making explicit imports work.

BUG REPORTS

       Please report bugs or other issues to <bug-module-load@rt.cpan.org<gt>.

AUTHOR

       This module by Jos Boumans <kane@cpan.org>.

COPYRIGHT

       This library is free software; you may redistribute and/or modify it under the same terms as Perl itself.

perl v5.18.2							    2013-11-04							 Module::Load(3pm)
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