linux:process_management [Whizzbang Tech Stuff]

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======Linux Process Management======
=====ps=====
  * process listing command
An example of a good general purpose process listing including a long formatted date-time of the start time of the command and the elapsed time since the process was started.
<code bash>
ps -eo pid,lstart,etime,cmd:128
</code>

  * List processes looking for specific process names.
  * Use a regex with a character class so that the grep command itself doesn't appear in the output of the //ps// command.

<code bash>
ps -ef | grep -i "[f]oobar"
</code>

  * List process hierarchy (tree)
<code bash>
ps -ejH
</code>

=====disown=====
  * process termination

When a process is started from a bash shell the process is a child of the shell and when the terminal session ends the child will be sent a signal that will result in the process being terminated. To prevent this the //bash// //disown -ha// command can be used to cause the child process to not receive the signal. As a result the process will remaining running after the terminal session ends.

=====nohup=====
''nohup'' runs the specified program so that it will not receive a hang-up signal when the terminal exists. Therefore the program will continue running like a daemon.
<code>
nohup python /path/to/script.py &
</code>