How do I put an already

 

I have a process that is already running for a long time and don't want to end it.

How do I put it under nohup (that is, how do I cause it to continue running even if I close the terminal?)

Using the Job Control of bash to send the process into the background:

  • Ctrl+Z to stop (pause) the program and get back to the shell.
  • bg to run it in the background.
  • disown -h [job-spec] where [job-spec] is the job number (like %1 for the first running job; find about your number with the jobs command) so that the job isn't killed when the terminal closes.

    • Suppose for some reason Ctrl+Z is also not working, go to another terminal, find the process id (using ps ) and run: 

    kill -20 PID 
kill -18 PID

    kill -20 ( SIGTSTP ) will suspend the process and kill -18 ( SIGCONT ) will resume the process, in background. So now, closing both your terminals won't stop your process.

    The command to separate a running job from the shell ( = makes it nohup) is disown and a basic shell-command.

    From bash-manpage (man bash):

    disown [-ar] [-h] [jobspec ...]

    Without options, each jobspec is removed from the table of active jobs. If the -h option is given, each jobspec is not removed from the table, but is marked so that SIGHUP is not sent to the job if the shell receives a SIGHUP. If no jobspec is present, and neither the -a nor the -r option is supplied, the current job is used. If no jobspec is supplied, the -a option means to remove or mark all jobs; the -r option without a jobspec argument restricts operation to running jobs. The return value is 0 unless a jobspec does not specify a valid job.

    That means, that a simple 

    disown -a

    will remove all jobs from the job-table and makes them nohup

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