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If you've already started a process and want to log off and
keep it running in the background, you'll need to use the
renice command. For example, you
have myprog running, and you need to log off. First,
you will need to determine what process id (PID) the program
is using with the ps command:
ps -a | grep myprog
you should see something like:
9884 pts/4 0:20 myprog
This tells you that it's PID 9884 and is associated
(currently) with tty4. The standard syntax for the
renice command is:
renice -n PRI -p PID
where PRI is how you want to alter the priority of
the process, and PID is the process id. To
renice the process so you can log off
and not have niceguy kill it, you
would type:
renice -n 19 -p 9884
This would add 19 to the priority, lowering it to 19 (from
the base of 0), thus rendering it safe from
niceguy. It would then run when nothing else on
the system needed to run, eventually completing without you
needing to stay logged on.
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