NOHUP(1)
NAME
nice, nohup − run a command at a different priority (sh only)
USAGE
nice [ −increment ] command [ arguments ]
nohup command [ arguments ]
DESCRIPTION
Nice can execute a specified command with a lower or higher CPU scheduling priority. You may specify an increment argument in the range of -19 through +19 (the default is +10). A specified increment larger than 19 will still be equivalent to 19. To run commands with a higher than normal priority, use a negative increment (e.g., nice −−10). To run them at a lower priority, use a positive increment. The higher the number in positive terms, the lower the priority will be for running a command.
Nohup executes the specified command, immune to hangup and terminate signals from the controlling terminal. Priority is incremented by five. You should invoke nohup from the Shell with an ampersand (&), to prevent it from responding to interrupts by or stealing input from the next person who logs in on the same terminal. Nohup also uses a syntax that is different from that of nice.
CAUTIONS
Nice and nohup are particular to sh (1). If you use csh (1), commands executed with an ampersand (&) are automatically immune to hangup signals while in the background. A built-in command, nohup, provides immunity from termination, but it does not redirect output to nohup.out.
Nice is built into csh (1) with a slightly different syntax than that described here. The form nice +10 runs a command at a fairly low priority, while nice −10 gives a process quite a bit of processor time.
FILES
nohup.out standard output and standard error file under nohup
DIAGNOSTICS
Nice returns the exit status of the subject command.