check process id exists
kill -0 pid
sending the signal 0 to a given PID just checks if any process with the given PID is running and you have the permission to send a signal to it.
$ man 2 kill
If sig is 0, then no signal is sent, but error checking is still performed; this can be used to check for the existence of a process ID or process group ID.
check exists, return 0
$ pgrep httpd
46775
$ kill -0 46775
$ echo $?
0
check non-exists, return 1
$ kill -0 999999899
bash: kill: (999999899) - No such process
$ echo $?
1
kill process id stored in .pid file
#!/bin/sh
pid_file=/var/run/process.pid
kill -0 $(cat $pid_file) 2>/dev/null
if [ $? -eq 0 ]; then
kill $(cat $pid_file)
fi
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