How to get process ID using "pidof"

[zubit]

Hi,

I tried to get process ID using pidof. It didn't give any error but a blank output at console

$ pidof -s instance1

$

But when I use ps -ef, I get the process ID

$ ps -ef | grep instance1
root      4174 21661  0 06:52 pts/1    00:00:00 grep instance1
provgw   30220 30219 28 06:46 pts/1    00:01:44 /usr/java/jdk1.6.0_18/bin/java -Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager -Djava.util.logging.config.file=/opt/provgw/tomcat/instance1/conf/logging.properties -Dinstance_id=instance1 -Dglobal.conf=/etc/provgw -Daxis.xml.reuseParsers=true -Xbatch -dsa -Xrs -Xss128k -XX:+UseParallelGC -XX:ParallelGCThreads=20 -XX:+AggressiveOpts -Xms10097514k -Xmx10097514k -Xmn3029255k -XX:MaxPermSize=256m -XX:+CMSClassUnloadingEnabled -Xdebug -Xrunjdwp:transport=dt_socket,address=8000,server=y,suspend=n -Djava.endorsed.dirs=/opt/provgw/tomcat/endorsed -classpath :/opt/provgw/tomcat/bin/bootstrap.jar:/opt/provgw/tomcat/bin/onends-tomcat.jar -Dcatalina.base=/opt/provgw/tomcat/instance1 -Dcatalina.home=/opt/provgw/tomcat -Djava.io.tmpdir=/opt/provgw/tomcat/instance1/temp org.apache.catalina.startup.Bootstrap start

Actually i'm writing a shell script. So I thought if i can get the process ID directly using "pidof" it'd be helpful. Can someone please help?

[Cabhan]

Please do not double post.