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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

locale::script5.18

Locale::Script(3pm)					 Perl Programmers Reference Guide				       Locale::Script(3pm)

NAME

       Locale::Script - standard codes for script identification

SYNOPSIS

	  use Locale::Script;

	  $script  = code2script('phnx');		      # 'Phoenician'
	  $code    = script2code('Phoenician'); 	      # 'Phnx'
	  $code    = script2code('Phoenician',
				 LOCALE_CODE_NUMERIC);	      # 115

	  @codes   = all_script_codes();
	  @scripts = all_script_names();

DESCRIPTION

       The "Locale::Script" module provides access to standards codes used for identifying scripts, such as those defined in ISO 15924.

       Most of the routines take an optional additional argument which specifies the code set to use. If not specified, the default ISO 15924
       four-letter codes will be used.

SUPPORTED CODE SETS

       There are several different code sets you can use for identifying scripts. A code set may be specified using either a name, or a constant
       that is automatically exported by this module.

       For example, the two are equivalent:

	  $script = code2script('phnx','alpha');
	  $script = code2script('phnx',LOCALE_SCRIPT_ALPHA);

       The codesets currently supported are:

       alpha, LOCALE_SCRIPT_ALPHA
	   This is a set of four-letter (capitalized) codes from ISO 15924 such as 'Phnx' for Phoenician.  It also includes additions to this set
	   included in the IANA language registry.

	   The Zxxx, Zyyy, and Zzzz codes are not used.

	   This is the default code set.

       num, LOCALE_SCRIPT_NUMERIC
	   This is a set of three-digit numeric codes from ISO 15924 such as 115 for Phoenician.

ROUTINES

       code2script ( CODE [,CODESET] )
       script2code ( NAME [,CODESET] )
       script_code2code ( CODE ,CODESET ,CODESET2 )
       all_script_codes ( [CODESET] )
       all_script_names ( [CODESET] )
       Locale::Script::rename_script  ( CODE ,NEW_NAME [,CODESET] )
       Locale::Script::add_script  ( CODE ,NAME [,CODESET] )
       Locale::Script::delete_script  ( CODE [,CODESET] )
       Locale::Script::add_script_alias  ( NAME ,NEW_NAME )
       Locale::Script::delete_script_alias  ( NAME )
       Locale::Script::rename_script_code  ( CODE ,NEW_CODE [,CODESET] )
       Locale::Script::add_script_code_alias  ( CODE ,NEW_CODE [,CODESET] )
       Locale::Script::delete_script_code_alias  ( CODE [,CODESET] )
	   These routines are all documented in the Locale::Codes::API man page.

SEE ALSO

       Locale::Codes
	   The Locale-Codes distribution.

       Locale::Codes::API
	   The list of functions supported by this module.

       http://www.unicode.org/iso15924/
	   Home page for ISO 15924.

       http://www.iana.org/assignments/language-subtag-registry
	   The IANA language subtag registry.

AUTHOR

       See Locale::Codes for full author history.

       Currently maintained by Sullivan Beck (sbeck@cpan.org).

COPYRIGHT

	  Copyright (c) 1997-2001 Canon Research Centre Europe (CRE).
	  Copyright (c) 2001-2010 Neil Bowers
	  Copyright (c) 2010-2013 Sullivan Beck

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

perl v5.18.2							    2013-11-04						       Locale::Script(3pm)
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