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Full Discussion: Inconsistent `ps -eaf -o args | grep -i sfs_pcard_load_file.ksh | grep -v grep | wc -l`
Top Forums Shell Programming and Scripting Inconsistent `ps -eaf -o args | grep -i sfs_pcard_load_file.ksh | grep -v grep | wc -l` Post 302911231 by Corona688 on Wednesday 30th of July 2014 03:25:10 PM
Old 07-30-2014
The traditional way to avoid ps | grep | cut | sed | awk | tr | ed | head | tail | kitchen | sink is to use a PID file. Store your program's PID ($$ in shell) in a file so other things can track if you're still running or died unexpectedly.

Code:
#!/bin/sh

# Traditional location is /var/run/..., but not everything can write there
PIDFILE="/tmp/sfs_pcard.pid"

if [ -e "$PIDFILE" ]
then
        read PID < "$PIDFILE"
        if ps "$PID" >/dev/null 2>/dev/null
        then
                echo "$PIDFILE has $PID, which is still running" >&2
                exit 1
        fi
fi

# PID file either missing, or the process in it no longer exists.
echo "$$" > "$PIDFILE"
# Delete the PID file when the process exits
trap "rm -f '$PIDFILE'" EXIT

# Rest of the program's code.
...

Much less of a kludge and should work on most systems.
 

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LEARN ABOUT DEBIAN

ircd-ratbox

IRCD-RATBOX(8)						  System Administration Commands					    IRCD-RATBOX(8)

NAME

       ircd-ratbox - Advanced, stable and fast ircd

SYNOPSIS

       ircd-ratbox [-help | -version]

       ircd-ratbox [-basedir BASEDIR] [-configfile CONFFILE] [-logfile LOGFILE] [-pidfile PIDFILE] [-foreground] [-conftest]

DESCRIPTION

       ircd-ratbox is the main ircd daemon responsible for running the IRC server. It delegates specific tasks to several other daemons: resolver,
       ssld, bandb.

OPTIONS

       -help
	   Show summary of options.

       -version
	   Display version information.

       -basedir BASEDIR
	   Before starting the server, enter BASEDIR directory (chdir).

       -configfile CONFFILE
	   Set configuration file (defaults to /etc/ircd-ratbox/ircd.conf).

       -logfile LOGFILE
	   Set main log path (defaults to /var/log/ircd-ratbox/ircd.log).

       -pidfile PIDFILE
	   Set file used to store main daemon PID (defaults to /etc/ircd-ratbox/ircd.pid).

       -foreground
	   Don't detach process in the background.

       -conftest
	   Check configuration and exit.

AUTHOR

       Marc `Duck` Dequenes <Duck@DuckCorp.org>
	   Original author.

COPYRIGHT

       Copyright (C) 2011 Marc Dequenes (Duck)

       This manual page was written for the Debian system (but may be used by others). Permission is granted to copy, distribute and/or modify
       this document under the terms of the GNU General Public License, Version 3 or any later version published by the Free Software Foundation.

       On Debian systems, the complete text of the GNU General Public License version 3 can be found in /usr/share/common-licenses/GPL-3.

ircd ratbox							    2011-11-07							    IRCD-RATBOX(8)
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