Wait for an already launched program to stop before starting a new command.

• Wait for an already launched program to stop before starting a new command.

  Referring to the original post, if you are using $! then that means the process is a child of the current shell, so you can just use `wait $!`. If you are trying to wait for a process created outside of the current shell, then the loop on `kill -0 $PID` is good; although, you can't get the exit status of the process.

  This is sample output - yours may be different.

  
  

  3
  wait $!
  noahspurrier · 2010-06-07 21:56:36 0
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• Wait for an already launched program to stop before starting a new command.

  If you really _must_ use a loop, this is better than parsing the output of 'ps': PID=$! ;while kill -0 $PID &>/dev/null; do sleep 1; done kill -0 $PID returns 0 if the process still exists; otherwise 1

  This is sample output - yours may be different.

  
  

  0
  wait
  bhepple · 2010-01-15 04:03:11 2
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