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What are the differences between

  • Kill a process
  • Suspend a process
  • Terminate a process

In which situation is each term used.

10

To suspend a process means to make it stop executing for some time. When the process is suspended, it doesn't run, but it's still present in memory, waiting to be resumed (woken up). A process can be suspended by sending it the STOP signal, and resumed by sending it the CONT signal.

To kill a process means to cause it to die. This can be done by sending it a signal. There are various different signal, and they don't all cause the process to die. the KILL signal always does cause the process to die; some other signals typically do but the process can choose to do something different; and there are signals whose role is not to cause the process to die, for example STOP and CONT. Note that the kill utility and the kill C function send a signal, which may or may not actually kill the process.

To terminate a process means to cause it to die. The difference between kill and terminate is that kill generally refers specifically to sending a signal, whereas terminate usually also includes other methods such as sending the process a command that tells it to exit (if the process includes a command interpreter of some kind).

  • Noob related question: If I've got an SSH session going into a remote unit, and a process X going on the remote unit, will Ctrl-Z suspend process X, or the SSH session itself? – brianfit Jan 16 at 8:11
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    @brianfit The SSH client transmits Ctrl-Z to the server, so it will suspend process X. To suspend the OpenSSH client, type ~ (tilde) then Ctrl-Z at the beginning of a line. – Gilles Jan 16 at 8:14

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