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I am having trouble terminating applications started from the terminal - for example, I used: cd /usr/bin and ls to determine that the gimp app is here.

I then started gimp by typing "gimp" - started successfully.

BUT, I cant stop / exit the program. There is no "$" sign from which to start (indicating that the process is running, I suppose).

I have tried: (gimp:23558): GEGL-gegl-operation.c-WARNING **: Cannot change name of operation class 0x29DFB70 from "gimp:point-layer-mode" to "gimp:anti-erase-mode"

kill pwd kill exit q quit Q QUIT TERM SIGTERM

None of these work - neither would I expect them to because there is no "$" sign to begin from.

  • To clarify, when you say you started gimp from a terminal, do you mean you ssh-ed into a computer and typed in gimp in that ssh session? Or you logged into a computer using a GUI, brought up a terminal and typed gimp in that terminal window? – Lewis M Nov 13 '18 at 16:08
  • Hi - am running Ubuntu 16. I booted up into this and then opened a terminal. I then opened gimp from the terminal. – user6542 Nov 13 '18 at 18:05
  • I see someone down-voted my question - indicating their belief that I showed "no research effort". On the contrary - I have been trying to solve this for weeks - combing the internet and literature - no one could give the answer - coming up with very complex solutions yet, in the end, it is simple. Please note, I am 69 years old and trying to learn Linux - trust me, not easy. – user6542 Nov 13 '18 at 20:55
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I'm not sure if I understand but is it a case of "ctrl+C" to terminate the current program returning you to the shell prompt ($)?

  • PERFECT - worked perfectly! Many many thanks - most grateful for your patience! – user6542 Nov 13 '18 at 16:16
  • Funny - I tried to upvote your answer but it will not accept it. Strange. – user6542 Nov 13 '18 at 16:20
  • @user6542 you can accept this as answer fyi. – Prvt_Yadv Nov 13 '18 at 16:45
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Gimp (and others) will terminate with a Ctrl-C.

If you want to recover the command prompt, you can also use Ctrl-Z, which stops the current process (but doesn't terminate it) and returns to the shell prompt.

  • If you want the stopped process to continue running, in the background, enter bg.
  • If you want to resume the process in the foreground, enter fg

For more resilient processes, you can open another terminal (or tab) and use pkill {processname}, for instance pkill gimp. Note that the argument is a regex pattern (so for instance gimp could another process with gimp in its name) so use with caution. Normally no process can resist the -9 option, so use with extreme caution.

For GUI apps, there is another method: strike Alt-Ctrl-Escape: the cursor changes into a skull and bones, move it over a window of the process you want to kill and click or strike Enter to kill it. If you change your mind just hit Escape to return to the normal cursor. Also use with caution, if you click the background this will kill the desktop shell.

  • Thank you very much - greatly appreciated. DB – user6542 Nov 13 '18 at 18:06

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