shell - How to get only process ID in specify process name in linux? -

how process id specified process name in linux?

ps -ef|grep java     test 31372 31265  0 13:41 pts/1    00:00:00 grep java 

based on process id write logic. how process id specific process name.

sample program:

pids= ps -ef|grep java if [ -z "$pids" ]; echo "nothing" else mail test@domain.com fi 

you can use:

ps -ef | grep '[j]ava' 

or if pgrep available better use:

pgrep -f java