bash - How to check if a process id (PID) exists -

In a Bash script, I want to do the following (in the phonetic code):

  If [a process exists with $ PID]; So what is the proper expression for conditional statement to $ PID FI

To check the existence of a process,

  kill -0 $ PID

but as @onwind said, still going to kill it, just kill

  $ PID

Or you'll have a running position.

If you want to kill the kill text output and do something based on the exit code, you

  if doing so Can! $ PID & gt; Killing / Dev / null 2 & gt; and 1; Then "SIGTERM could not be sent to process PID" & gt; & Amp; 2f

Com