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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 V7

zgrep

ZGREP(1)						      General Commands Manual							  ZGREP(1)

NAME

       zgrep - search possibly compressed files for a regular expression

SYNOPSIS

       zgrep [ grep_options ] [ -e ] pattern filename...

DESCRIPTION

       Zgrep  invokes  grep  on  compressed  or  gzipped  files.   These  grep	options  will  cause  zgrep  to  terminate  with  an  error  code:
       (-[drRzZ]|--di*|--exc*|--inc*|--rec*|--nu*).  All other options specified are passed directly to grep.  If no file is specified,  then  the
       standard input is decompressed if necessary and fed to grep.  Otherwise the given files are uncompressed if necessary and fed to grep.

       If the GREP environment variable is set, zgrep uses it as the grep program to be invoked.

EXIT CODE

       2 - An option that is not supported was specified.

AUTHOR

       Charles Levert (charles@comm.polymtl.ca)

SEE ALSO

       grep(1), gzexe(1), gzip(1), zdiff(1), zforce(1), zmore(1), znew(1)

																	  ZGREP(1)
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