linux - kill a process in bash script -

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I would like to kill and restart a process and this command works on interactive mode but not in script mode.

Any suggestions: 

  "kill current server" "$ kill (ps -a | grep 'myserver.jar' | awk '{print $ 2}' ) Resonates || || echo 'active myser', exit; 1;

This can work: 

  v = $ (Pgrep -f myserver.jar) if [$? == 0]; then $ v else to "no server" fi # start server Kill ...

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