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32 .\" @(#)renice.8 8.1 (Berkeley) 6/9/93
33 .\" $FreeBSD: src/usr.bin/renice/renice.8,v 1.5.2.5 2002/06/17 23:58:46 tjr Exp $
34 .\" $DragonFly: src/usr.bin/renice/renice.8,v 1.2 2003/06/17 04:29:30 dillon Exp $
41 .Nd alter priority of running processes
44 .Op Ar priority | Op Fl n Ar increment
45 .Op Oo Fl p Oc Ar pid ...
46 .Op Oo Fl g Oc Ar pgrp ...
47 .Op Oo Fl u Oc Ar user ...
51 scheduling priority of one or more running processes.
54 parameters are interpreted as process ID's, process group
55 ID's, user ID's or user names.
57 a process group causes all processes in the process group
58 to have their scheduling priority altered.
60 a user causes all processes owned by the user to have
61 their scheduling priority altered.
62 By default, the processes to be affected are specified by
71 parameters to be interpreted as process group ID's.
73 Instead of changing the specified processes to the given priority,
74 interpret the following argument as an increment to be applied to
75 the current priority of each process.
79 parameters to be interpreted as user names or user ID's.
83 interpretation to be (the default) process ID's.
88 .Dl "renice +1 987 -u daemon root -p 32"
90 would change the priority of process ID's 987 and 32, and
91 all processes owned by users daemon and root.
93 Users other than the super-user may only alter the priority of
95 and can only monotonically increase their ``nice value''
99 (This prevents overriding administrative fiats.)
101 may alter the priority of any process
102 and set the priority to any value in the range
107 Useful priorities are:
108 20 (the affected processes will run only when nothing else
109 in the system wants to),
110 0 (the ``base'' scheduling priority),
111 anything negative (to make things go very fast).
113 .Bl -tag -width /etc/passwd -compact
115 to map user names to user ID's
133 Non super-users cannot increase scheduling priorities of their own processes,
134 even if they were the ones that decreased the priorities in the first place.