ps monitor

This script logs CPU load for a given process, every n seconds into a file
Requires : bash, ps, awk
Examples :
psmon <process name> [delay [logfile]]
psmon sshd→ logs %CPU load from process sshd, every 5 seconds, to file psmon.log.[day]
psmon q3ded 10 q3ded.log → logs %CPU load from process q3ded, every 10 seconds, to file q3ded.log

#!/bin/bash

if [ -z $1 ] ; then
	echo "Monitor a cpu load for a given process, every n seconds"
	echo "Usage : `basename $0` <process name> [delay [logfile]]"
	echo "   [delay] : defaults to 5 seconds"
	echo "   [logfile] : defaults to psmon.log.yymmdd.hhmmss"
	echo "   if you specify a logfile, you MUST specify a delay"
	echo "Example : psmon q3ded 10 q3dedmonitor.log"
	echo "Example : psmon q3ded"
	exit 0
fi

PROCESS=$1

if $(ps -C "$PROCESS">/dev/null) ; then
	# process exists
	WARNING=""
else
	# process doesnt exist
	WARNING="Warning : $PROCESS NOT running at the moment !"
fi


LOGFILE=$3
if [ -z $3 ] ; then
	LOGFILE=psmon.log.$(date +%Y%m%d.%H%M%S)
fi

DELAY=$2
if [ -z $2 ] ; then
	DELAY=5
fi

C="\033[1m"
N="\033[0m"

echo -e "${N}Monitoring $C$PROCESS$N cpu load, every $C$DELAY$N s, to file $C$LOGFILE"
echo -e $WARNING

echo "# psmon logfile" > $LOGFILE
echo "# Process name : $PROCESS" >> $LOGFILE
echo "# Started : $(date +%D\ \@\ %X)" >> $LOGFILE
echo "" >> $LOGFILE

# Now logging the stuff

while true; do
	ps -C "$PROCESS" -o "pcpu" | awk '{a+=$1} END {print a}' >> $LOGFILE
	sleep $DELAY
done

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