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

Question

How to get only the process ID for a specified process name in linux?

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

Based on the process id I will write some logic. So how do I get only the process id for a specific process name.

Sample program:

PIDS= ps -ef|grep java if [ -z "$PIDS" ]; then echo "nothing" else mail [email protected] fi 

Answer 1

You can pipe your output to awk to print just the PID. For example:

ps -ef | grep nginx | awk '{print $2}' 9439 

Answer 2

You can use:

ps -ef | grep '[j]ava' 

Or if pgrep is available then better to use:

pgrep -f java