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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 NETBSD

pidfile

PIDFILE(3)						   BSD Library Functions Manual 						PIDFILE(3)

NAME

     pidfile -- write a daemon pid file

LIBRARY

     System Utilities Library (libutil, -lutil)

SYNOPSIS

     #include <util.h>

     int
     pidfile(const char *path);

DESCRIPTION

     pidfile() creates a file containing the process ID of the caller program.	The pid file can be used as a quick reference if the process needs
     to be sent a signal.  When the program exits, the pid file is removed automatically, unless the program receives a fatal signal.

     If path is NULL or a plain basename (a name containing no directory components), the pid file is created in the /var/run directory.  The file
     name has the form /var/run/basename.pid.  The basename part is either the value of path if it was not NULL, or the program name as returned
     by getprogname(3) otherwise.

     If path is an absolute or relative path (i.e. it contains the '/' character), the pid file is created in the provided location.

     Note that only the first invocation of pidfile() causes a pid file to be written; subsequent invocations have no effect unless a new path is
     supplied.	If called with a new path, pidfile() will remove the old pid file and write the new one.

RETURN VALUES

     pidfile() returns 0 on success and -1 on failure.

SEE ALSO

     atexit(3)

HISTORY

     The pidfile() function call appeared in NetBSD 1.5.  Support for creating pid files in any arbitrary path was added in NetBSD 6.0.

BUGS

     pidfile() uses atexit(3) to ensure the pid file is unlinked at program exit.  However, programs that use the _exit(2) function (for example,
     in signal handlers) will not trigger this behaviour.

BSD
								  March 23, 2011							       BSD
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