09-04-2002
Kelam - the nohup isn't always needed. Running from the command line and backgrounding the job, you can exit without the job going away without the nohup.
Last login: Fri Aug 30 13:23:41 2002 from progserver
Sun Microsystems Inc. SunOS 5.8 Generic February 2000
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Sun Microsystems Inc. SunOS 5.8 Generic February 2000
medusa% sleep 600 &
[1] 10341
medusa% exit
medusa% logout
Connection to medusa closed.
medusa% ps -ef|grep sleep
tghunter 10341 1 0 13:49:16 ? 0:00 sleep 600
And on HP-UX 11.0 it lets you know about the job but if you exit anyway, it's still there (of course, root now owns it on HP - now I need to look into what other fun that can cause).
[unixops@isaac]:/export/home/unixops
$ sleep 600 &
[1] 20884
[unixops@isaac]:/export/home/unixops
$ exit
You have running jobs
[unixops@isaac]:/export/home/unixops
$ exit
logout
Connection closed by foreign host.
[unixops@isaac]:/export/home/unixops
$ ps -ef|grep sleep
root 20814 1515 0 13:48:10 ? 0:00 /usr/bin/sleep 300
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nice(1) General Commands Manual nice(1)
Name
nice, nohup - execute a command at a lower priority
Syntax
nice [-number] command [arguments]
nohup command [arguments]
Description
The command executes command with low scheduling priority (Bourne Shell only). If the number argument is present, the priority is incre-
mented (higher numbers mean lower priorities) by that amount up to a limit of 20. The default number is 10.
The super-user may run commands with priority higher than normal by using a negative priority, for example, `--10'.
The command executes command immune to hangup and terminate signals from the controlling terminal. The priority is incremented by 5. The
command should be invoked from the shell with an ampersand (&) in order to prevent it from responding to interrupts by or stealing the
input from the next person who logs in on the same terminal. The syntax of is also different.
Options
-number Increments the priority by a specified number up to a limit of 20. The default is 10.
Restrictions
The and commands are particular to If you use then commands executed with an ampersand (&) are automatically immune to hangup signals while
in the background. There is a built-in command which provides immunity from terminate, but it does not redirect output to nohup.out.
The command is built into with a slightly different syntax than described here. The form ``nice +10'' nices to positive nice, and ``nice
-10'' can be used by the superuser to give a process more of the processor.
Diagnostics
The command returns the exit status of the subject command.
Files
nohup.out standard output and standard error file under nohup
See Also
csh(1), getpriority(2), renice(8)
nice(1)