10-03-2006
Script to check status of a PID
i'm just learning scripting, and have been banging my head against this
I want to check if my WAS6 java process is running and if so..echo me a messages. If not then echo me a different messages
the problem i have is I dont know how to represent a NULL return value. If i grep for a was6 java pid, the $? is always '0'...no matter if a PID came back or not. any idea on how to write/rewrite this??
PID=`/usr/ucb/ps -auxwww |grep -i [s]erver1 |grep -v grep | awk '{print $2}'`
if [ $? -eq ] ; then ( i have also tried `if [ $PID -eq ] ; then)
echo " WAS6 is down,please restart"
else
echo " WAS6 is running, no action needed"
fi
--------------------------------------------------------------------
In addition, i've tried this variation below, which seems like works ..but i always get the error when executing..
# cat test.ksh
#!/bin/ksh
#
# Check to see if URLs respond in a given time period
#
BASE_DIR="/local/apps/adminutils"
WGET="$BASE_DIR/bin/wget"
DAT_FILE="$BASE_DIR/etc/url_check.dat"
MAIL_LIST="user@net.net"
PID=`/usr/ucb/ps -auxwww |grep -i [s]erver1 |grep -v grep | awk '{print $2}'`
if [ $PID = ] ; then
echo " WAS6 is down,please restart"
else
echo " WAS6 is running, no action needed"
fi
# ./test.ksh
./test.ksh[11]: test: argument expected
WAS6 is running, no action needed
#
~
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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)