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How to run an already running process in background

if you have a program running in the foreground then:

  • press Ctrl-Z to suspend the running program, it will displays a job number and a "Stopped" message and returns you to a bash prompt
[1]+  Stopped                 myprogram
  • Disowning the process with disown
disown -h %1

I've used a 1, but you'd use the job number that was displayed in the Stopped message) which marks the job so it ignores the SIGHUP signal (it will not be stopped by logging out). If there is only one job, then you don't need to specify the job number. Just use disown -h

  • Make it running in background
bg 1

The bg command uses the same job number to make it running in background. This resumes the running program in the background and a message is displayed confirming that.

[1]+ myprogram &
  • You can now log out and it will continue running.