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OpenDarwin 7.2.1 - man page for renice (opendarwin section 8)

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RENICE(8)			   BSD System Manager's Manual				RENICE(8)

NAME
     renice -- alter priority of running processes

SYNOPSIS
     renice [priority | [-n increment]] [[-p] pid ...] [[-g] pgrp ...] [[-u] user ...]

DESCRIPTION
     The renice utility alters the scheduling priority of one or more running processes.  The
     following who parameters are interpreted as process ID's, process group ID's, user ID's or
     user names.  The renice'ing of a process group causes all processes in the process group to
     have their scheduling priority altered.  The renice'ing of a user causes all processes owned
     by the user to have their scheduling priority altered.  By default, the processes to be
     affected are specified by their process ID's.

     The following options are available:

     -g      Force who parameters to be interpreted as process group ID's.

     -n      Instead of changing the specified processes to the given priority, interpret the
	     following argument as an increment to be applied to the current priority of each
	     process.

     -u      Force the who parameters to be interpreted as user names or user ID's.

     -p      Reset the who interpretation to be (the default) process ID's.

     For example,

	   renice +1 987 -u daemon root -p 32

     would change the priority of process ID's 987 and 32, and all processes owned by users dae-
     mon and root.

     Users other than the super-user may only alter the priority of processes they own, and can
     only monotonically increase their ``nice value'' within the range 0 to PRIO_MAX (20).  (This
     prevents overriding administrative fiats.)  The super-user may alter the priority of any
     process and set the priority to any value in the range PRIO_MIN (-20) to PRIO_MAX.  Useful
     priorities are: 20 (the affected processes will run only when nothing else in the system
     wants to), 0 (the ``base'' scheduling priority), anything negative (to make things go very
     fast).

FILES
     /etc/passwd  to map user names to user ID's

SEE ALSO
     nice(1), rtprio(1), getpriority(2), setpriority(2)

STANDARDS
     The renice utility conforms to IEEE Std 1003.1-2001 (``POSIX.1'').

HISTORY
     The renice utility appeared in 4.0BSD.

BUGS
     Non super-users cannot increase scheduling priorities of their own processes, even if they
     were the ones that decreased the priorities in the first place.

BSD					   June 9, 1993 				      BSD
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