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Full Discussion: Use the same perl script with several different variables
Top Forums Shell Programming and Scripting Use the same perl script with several different variables Post 302358523 by varontron on Friday 2nd of October 2009 08:39:26 PM
Old 10-02-2009
so say you put your variables in space-delimited lines in a file name 'in.txt'. The content of this file for example is:
Code:
abc def ghi
jkl mno pqr

you could invoke your script 'script.pl' like this:
Code:
script.pl in.txt out.txt

as you may know, in.txt is passed into the script in the default array ARGV.

inside your script, you would have something like this, then, to create file handles to open the input file, and a second arg for the output file

Code:
open FHIN,"<$ARGV[0]";
open FHOUT, ">$ARGV[1]";

then you would read the input file line by line, splitting each line on spaces into an array, to pass to your processing function for output:

Code:
#!/usr/bin/perl

# the function you will execute with your vars
sub proc_array
{
   # open the output filehandle
   open FHOUT, ">ARGV[1]";
   #iterate over the array you pass to the function
   foreach my $var (@_)
   {
          # here it just prints the value and a newline
          # but you would be doing something more interesting
	  print FHOUT $var."\n"
   }	
   # close the output filehandle
   close FHOUT;
}

#open the file handle
open FHIN, $ARGV[0];

#iterate over each line in the file
foreach my $line (<FHIN>)
{
        # split the space-delimited var strings and store each var in an array
	my @vars = split(/\s/,$line);
        # pass the array to your processing function
	proc_array(@vars);
}
# close the filehandle when done
close FHIN;

the output of the script in this example is:
Code:
abc
def
ghi
jkl
mno
pqr

if you want to output to multiple files, you could either pass in multiple args, or name your file with timestamps or something else programmatically.
Last edited by varontron; 10-03-2009 at 12:27 AM..
 

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service

service(8)						      System Manager's Manual							service(8)

NAME

       service - run a System V init script

SYNOPSIS

       service SCRIPT COMMAND [OPTIONS]

       service --status-all

       service --help | -h | --version

DESCRIPTION

       service runs a System V init script in as predictable environment as possible, removing most environment variables and with current working
       directory set to /.

       The SCRIPT parameter specifies a System V init script, located in /etc/init.d/SCRIPT.  The  supported  values  of  COMMAND  depend  on  the
       invoked	script,  service  passes  COMMAND and OPTIONS it to the init script unmodified.  All scripts should support at least the start and
       stop commands.  As a special case, if COMMAND is --full-restart, the script is run twice, first with the stop command, then with the  start
       command.

       service --status-all runs all init scripts, in alphabetical order, with the status command.

EXIT CODES

       service calls the init script and returns the status returned by it.

FILES

       /etc/init.d
	      The directory containing System V init scripts.

ENVIRONMENT

       LANG, TERM
	      The only environment variables passed to the init scripts.

SEE ALSO

       /etc/init.d/skeleton,
       update-rc.d(8),
       init(8),
       invoke-rc.d(8).

								     Jan 2006								service(8)
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