nice, nohup \- run a command at low priority
with low scheduling priority.
argument is present, the priority is incremented (higher
numbers mean lower priorities) by that amount up to a limit of 20.
The super-user may run commands with
priority higher than normal
by using a negative priority,
immune to hangup and terminate signals from the controlling terminal.
The priority is incremented by 5.
should be invoked from the shell with `&' in order to
prevent it from responding to interrupts by or
the next person who logs in on the same terminal.
nohup.out standard output and standard error file under
returns the exit status of the subject command.