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Full Discussion: [bash] Executing script that is held in a variable
Top Forums Shell Programming and Scripting [bash] Executing script that is held in a variable Post 302387627 by Scrutinizer on Sunday 17th of January 2010 06:49:14 PM
Old 01-17-2010
Hi ASGR, you could give this a try:
Code:
function array_script   { local IFS=$'\n'; eval "\${$1[0]#\#!} <(printf \"\${$1[*]}\")"; }

I removed the :1 and added the escape inner double quotes.

---

I think the script you provided is perhaps a tad difficult to read. I am not convinced arrays are the way to go since IMO plain variables will serve that same purpose just fine. Also I am not sure if the abundant use of functions together with call by name paramter passing through the eval mechanism adds much to the clarity of the script.

---

FWIW, based on your latest input file specifications I created the following example script for you to use as a comparison:
Code:
#!/bin/sh
reading_script=false
while IFS= read -r line
do
  case $line in
    "[script-"*)
       if $reading_script; then
         printf "$script" | eval "${shebang#\#!}"
         script=""; shebang=""
       fi
       reading_script=true
       IFS= read -r shebang
    ;;
    "["*)
       reading_script=false
       printf "$script" | eval "${shebang#\#!}"
       script=""; shebang=""
    ;;
    *) if $reading_script; then
         script="$script$line\n"
       else
         printf "$line\n"
       fi
    ;;
  esac
done < infile
if $reading_script; then
  printf "$script" | eval "${shebang#\#!}"
fi

Output:
Code:
################################################################################
## LOCAL SCRIPTS
################################################################################
Hello, Bash!
Hello, Bash!
Hello, Bash!
Hello, Bash!
Hello, Bash!
Hello, Bash!
Hello, Bash!
Hello, Bash!
Hello, Bash!
Hello, Bash!
Hello, Perl!
Hello, Python!

And here is the same script using a plain function with global variables and no parameters passing:
Code:
#!/bin/sh
exec_script()
{
  if $READING_SCRIPT; then
    printf "$SCRIPT" | eval "${SHEBANG#\#!}"
    SCRIPT=""; SHEBANG=""
  fi
}

READING_SCRIPT=false
while IFS= read -r line
do
  case $line in
    "[script-"*)
       exec_script
       READING_SCRIPT=true
       IFS= read -r SHEBANG
    ;;
    "["*)
       exec_script
       READING_SCRIPT=false
    ;;
    *) if $READING_SCRIPT; then
         SCRIPT="$SCRIPT$line\n"
       else
         printf "$line\n"
       fi
    ;;
  esac
done < infile
exec_script

S.
 

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LEARN ABOUT CENTOS

locale::codes::langfam

Locale::Codes::LangFam(3)				User Contributed Perl Documentation				 Locale::Codes::LangFam(3)

NAME

       Locale::Codes::LangFam - standard codes for language extension identification

SYNOPSIS

	  use Locale::Codes::LangFam;

	  $lext = code2langfam('apa');		       # $lext gets 'Apache languages'
	  $code = langfam2code('Apache languages');    # $code gets 'apa'

	  @codes   = all_langfam_codes();
	  @names   = all_langfam_names();

DESCRIPTION

       The "Locale::Codes::LangFam" module provides access to standard codes used for identifying language families, such as those as defined in
       ISO 639-5.

       Most of the routines take an optional additional argument which specifies the code set to use. If not specified, the default ISO 639-5
       language family codes will be used.

SUPPORTED CODE SETS

       There are several different code sets you can use for identifying language families. 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:

	  $lext = code2langfam('apa','alpha');
	  $lext = code2langfam('apa',LOCALE_LANGFAM_ALPHA);

       The codesets currently supported are:

       alpha
	   This is the set of three-letter (lowercase) codes from ISO 639-5 such as 'apa' for Apache languages.

	   This is the default code set.

ROUTINES

       code2langfam ( CODE [,CODESET] )
       langfam2code ( NAME [,CODESET] )
       langfam_code2code ( CODE ,CODESET ,CODESET2 )
       all_langfam_codes ( [CODESET] )
       all_langfam_names ( [CODESET] )
       Locale::Codes::LangFam::rename_langfam  ( CODE ,NEW_NAME [,CODESET] )
       Locale::Codes::LangFam::add_langfam  ( CODE ,NAME [,CODESET] )
       Locale::Codes::LangFam::delete_langfam  ( CODE [,CODESET] )
       Locale::Codes::LangFam::add_langfam_alias  ( NAME ,NEW_NAME )
       Locale::Codes::LangFam::delete_langfam_alias  ( NAME )
       Locale::Codes::LangFam::rename_langfam_code  ( CODE ,NEW_CODE [,CODESET] )
       Locale::Codes::LangFam::add_langfam_code_alias  ( CODE ,NEW_CODE [,CODESET] )
       Locale::Codes::LangFam::delete_langfam_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.loc.gov/standards/iso639-5/id.php
	   ISO 639-5 .

AUTHOR

       See Locale::Codes for full author history.

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

COPYRIGHT

	  Copyright (c) 2011-2013 Sullivan Beck

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

perl v5.16.3							    2013-02-27						 Locale::Codes::LangFam(3)
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