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Full Discussion: Conversion of Perl Script to Shell Script..
Top Forums Shell Programming and Scripting Conversion of Perl Script to Shell Script.. Post 302929458 by ongoto on Sunday 21st of December 2014 11:04:00 PM
Old 12-22-2014
@ Corona688

The devils' advocate here. Smilie
Quote:
You do not "call" a shell.
You're right. Calling 'uname -r' is not a call to the shell. /bin/uname is a binary that has nothing to do with the shell. I should say 'system calls' instead.

Some say that, because Perl uses system calls, you might as well use Bash. That presumes that Linux binaries are Bash builtins. If you call uname or ping, or any other binary from Bash; is that different than calling one from Perl? Not at all. Bash scripts use system binaries the same way Perl does.

Quote:
You have backpedaled miles from your argument that shell code is somehow "unsafe" while perl code running plethoras of individual short-lived shells is somehow not.
Bash just received a security upgrade. That speaks to that.
You dont have to fork a shell to run Linux binaries. Most returns go to stdout or stderr. Why would you need a shell. Does Awk require a shell fork? The standards guys would know more about that than I would.

I'm not back pedaling at all. Perl and other high level languages have libraries; huge volumes of reusable code to handle most anything. On big projects, they can save you hours, if not days of work. For the most part, they are tried and proven and secure, given there are no absolutes.

Again, I use the shell most of the time because I rarely ever do anything big in a coding sense. But if I did, I wouldn't use the shell. Speed alone is a factor. You mentioned Awk; 10 times faster than the shell.
Last edited by ongoto; 12-22-2014 at 12:14 AM..
 

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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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