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Full Discussion: Cannot execute Unix command in a simple perl script
Top Forums Shell Programming and Scripting Cannot execute Unix command in a simple perl script Post 302558463 by Corona688 on Friday 23rd of September 2011 04:01:20 PM
Old 09-23-2011
Thank you. That helps a lot, because the output I found on google is very different from the output you have.

I know what awk is. You can do the entire thing in awk. It supports floating point.

---------- Post updated at 02:01 PM ---------- Previous update was at 01:34 PM ----------

Code:
#!/bin/sh

printf "Please Enter the VG name to be checked: "
read VOL

printf "Please Enter the free size to be checked in GB: "
read SIZE

vgdisplay "$VOL" 2> /dev/null | awk -v VOL="$VOL" -v SIZE="$SIZE" '
        # Capture the last field of these two lines
        /Free PE/       { FREE=$NF; }
        /PE Size/       { PE=$NF; }
END {   if( (!FREE) || (!PE) )
        {
                print VOL, "does not exist"
                exit
        }

        # Get EXACTLY how many PE is needed.
        NEEDPE=sprintf("%d", ((SIZE*1024)/PE) );
        # .000001 more means we need a whole extra PE.
        if( (SIZE * 1024) - (NEEDPE*PE) > 0) NEEDPE++;

        if(NEEDPE <= FREE)
                printf("%s has enough, %f GB needs %d/%d free PE\n", VOL, SIZE, NEEDPE, FREE);
        else    printf("%s has %d PE, %d more are needed\n", VOL, FREE, NEEDPE-FREE);
}'

 

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LEARN ABOUT DEBIAN

plack::app::cgibin

Plack::App::CGIBin(3pm) 				User Contributed Perl Documentation				   Plack::App::CGIBin(3pm)

NAME

       Plack::App::CGIBin - cgi-bin replacement for Plack servers

SYNOPSIS

	 use Plack::App::CGIBin;
	 use Plack::Builder;

	 my $app = Plack::App::CGIBin->new(root => "/path/to/cgi-bin")->to_app;
	 builder {
	     mount "/cgi-bin" => $app;
	 };

	 # Or from the command line
	 plackup -MPlack::App::CGIBin -e 'Plack::App::CGIBin->new(root => "/path/to/cgi-bin")->to_app'

DESCRIPTION

       Plack::App::CGIBin allows you to load CGI scripts from a directory and convert them into a PSGI application.

       This would give you the extreme easiness when you have bunch of old CGI scripts that is loaded using cgi-bin of Apache web server.

HOW IT WORKS

       This application checks if a given file path is a perl script and if so, uses CGI::Compile to compile a CGI script into a sub (like
       ModPerl::Registry) and then run it as a persistent application using CGI::Emulate::PSGI.

       If the given file is not a perl script, it executes the script just like a normal CGI script with fork & exec. This is like a normal web
       server mode and no performance benefit is achieved.

       The default mechanism to determine if a given file is a Perl script is as follows:

       o   Check if the filename ends with ".pl". If yes, it is a Perl script.

       o   Open the file and see if the shebang (first line of the file) contains the word "perl" (like "#!/usr/bin/perl"). If yes, it is a Perl
	   script.

       You can customize this behavior by passing "exec_cb" callback, which takes a file path to its first argument.

       For example, if your perl-based CGI script uses lots of global variables and such and are not ready to run on a persistent environment, you
       can do:

	 my $app = Plack::App::CGIBin->new(
	     root => "/path/to/cgi-bin",
	     exec_cb => sub { 1 },
	 )->to_app;

       to always force the execute option for any files.

AUTHOR

       Tatsuhiko Miyagawa

SEE ALSO

       Plack::App::File CGI::Emulate::PSGI CGI::Compile Plack::App::WrapCGI

       See also Plack::App::WrapCGI if you compile one CGI script into a PSGI application without serving CGI scripts from a directory, to remove
       overhead of filesystem lookups, etc.

perl v5.14.2							    2011-11-02						   Plack::App::CGIBin(3pm)
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