Sometimes there is a need to start a long running job on a remote server via ssh. In the case you forgot to use tmux or screen, the job on remote server will be automatically killed as soon as you close the terminal.
To avoid the process it being killed after your ssh session is over, you can detach it from the shell. In this case the job will remain running after you disconnect from the server.
In order to do this, first make sure that the job is running in background and then type disown. Disown will guarantee that SIGHUP signal will not be sent to the process, hence the process remains running.
Here is a short example:
# start your script that runs in foreground
$ ./myscript.sh
my script output
my script output
# press Ctrl+z to interrupt it
^Z
[1]+ Stopped ./myscript.sh
# make sure it runs in background by typing bg
$ bg
[1]+ ./myscript.sh &
# now type disown followed by job number. In our case it is number 1
$ disown %1
Now you can disconnect from the server without interrupting your process.