Perl Redirection Post: 302369091

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Top Forums Shell Programming and Scripting Perl Redirection Post 302369091 by SFNYC on Friday 6th of November 2009 12:14:21 PM

Old

11-06-2009

Registered User

You should always have

Code:

use strict;
use warnings;

in your code.

Once there, listen to their error & warning messages and clean them up.

"Use of uninitialized variable in line number so and so" is telling you that you are trying to print a variable with no value. Use an 'if' condition to test this before you print it or initialize the variable with some value by default.

To remove this message from your output, redirect stderr when you submit your script.

Code:

./myprog 2> /dev/null

should do the trick, but it won't get rid of the warning.

SFNYC

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pidof

PIDOF(8)						Linux System Administrator's Manual						  PIDOF(8)

NAME

       pidof -- find the process ID of a running program.

SYNOPSIS

       pidof [-s] [-c] [-n] [-x] [-m] [-o omitpid[,omitpid..]]	[-o omitpid[,omitpid..]..]  program [program..]

DESCRIPTION

       Pidof  finds  the  process  id's (pids) of the named programs. It prints those id's on the standard output. This program is on some systems
       used in run-level change scripts, especially when the system has a System-V like rc structure. In that case these scripts  are  located	in
       /etc/rc?.d, where ? is the runlevel. If the system has a start-stop-daemon (8) program that should be used instead.

OPTIONS

       -s     Single shot - this instructs the program to only return one pid.

       -c     Only  return  process ids that are running with the same root directory.	This option is ignored for non-root users, as they will be
	      unable to check the current root directory of processes they do not own.

       -n     Avoid stat(2) system function call on all binaries which are located on network based file systems like NFS.  Instead of using  this
	      option the the variable PIDOF_NETFS may be set and exported.

       -x     Scripts too - this causes the program to also return process id's of shells running the named scripts.

       -o omitpid
	      Tells  pidof  to omit processes with that process id. The special pid %PPID can be used to name the parent process of the pidof pro-
	      gram, in other words the calling shell or shell script.

       -m     When used with -o, will also omit any processes that have the same argv[0] and argv[1] as any explicitly omitted process	ids.  This
	      can be used to avoid multiple shell scripts concurrently calling pidof returning each other's pids.

EXIT STATUS

       0      At least one program was found with the requested name.

       1      No program was found with the requested name.

NOTES

       pidof is actually the same program as killall5; the program behaves according to the name under which it is called.

       When  pidof  is invoked with a full pathname to the program it should find the pid of, it is reasonably safe. Otherwise it is possible that
       it returns pids of running programs that happen to have the same name as the program you're after but are  actually  other  programs.  Note
       that that the executable name of running processes is calculated with readlink(2), so symbolic links to executables will also match.

SEE ALSO

       shutdown(8), init(8), halt(8), reboot(8), killall5(8)

AUTHOR

       Miquel van Smoorenburg, miquels@cistron.nl

								    01 Sep 1998 							  PIDOF(8)