I have this simple script where I execute a .jar file and I'd need its PID for killing it after the sleep command:
java -jar test.jar &> output.txt & pid=$! sleep 10
The problem is: the PID changes after the application gets fully launched, this pid I get in first place is not the same PID the application has after 10 seconds sleeping (I checked it using ps).
How can I track down the PID so that I can kill the fully launched application?
I've tried using pstree -p $pid but I get a long list of Java children processes and I thought there might be a better way to implement this other than getting every child process, extracting PID using grep and killing it, also because I'm not 100% sure this is working.
I found another solution using jps but I'd prefer use native linux commands for compatibility.
I don't necessarily need PID, using process name could be a way but I don't how to retrieve that either having only parent process' PID.
CodePudding user response：
If you want to use process name, might run :
$ kill -9 $(ps aux | grep '[t]est.jar' | awk '{print $2}')
Options Details:
kill: sends a kill signal(SIGTERM 15: Termination)to terminate any process gracefully.kill -9: sends a kill signal(SIGTERM 9:Kill)terminate any process immediately.ps: listing all processes.grep: filtering,[p]prevent actual grep process from showing up in ps results.awk: gives the second field of each line, which is PID. (ps output : $1:user, $2:pid ...)
CodePudding user response：
Two ways.
- use system. Exit() inbuilt function.
or
- redirect the pid number to a file and use later to kill the process.
Ex:-
java -jar test.jar &> output.txt & echo $! > pid-logs
cat pid-logs | xargs kill -9