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28 .\" @(#)renice.8 8.1 (Berkeley) 6/9/93
36 .Nd alter priority of running processes
40 .Op Oo Fl p Oc Ar pid ...
41 .Op Oo Fl g Oc Ar pgrp ...
42 .Op Oo Fl u Oc Ar user ...
45 .Op Oo Fl p Oc Ar pid ...
46 .Op Oo Fl g Oc Ar pgrp ...
47 .Op Oo Fl u Oc Ar user ...
52 scheduling priority of one or more running processes.
55 parameters are interpreted as process ID's, process group
56 ID's, user ID's or user names.
59 of a process group causes all processes in the process group
60 to have their scheduling priority altered.
63 of a user causes all processes owned by the user to have
64 their scheduling priority altered.
65 By default, the processes to be affected are specified by
68 The following options are available:
69 .Bl -tag -width indent
73 parameters to be interpreted as process group ID's.
75 Instead of changing the specified processes to the given priority,
76 interpret the following argument as an increment to be applied to
77 the current priority of each process.
81 parameters to be interpreted as user names or user ID's.
85 interpretation to be (the default) process ID's.
88 Users other than the super-user may only alter the priority of
90 and can only monotonically increase their ``nice value''
94 (This prevents overriding administrative fiats.)
96 may alter the priority of any process
97 and set the priority to any value in the range
102 Useful priorities are:
103 20 (the affected processes will run only when nothing else
104 in the system wants to),
105 0 (the ``base'' scheduling priority),
106 anything negative (to make things go very fast).
108 .Bl -tag -width /etc/passwd -compact
110 to map user names to user ID's
113 Change the priority of process ID's 987 and 32, and
114 all processes owned by users daemon and root.
116 .Dl "renice +1 987 -u daemon root -p 32"
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.