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32 .\" @(#)renice.8 8.1 (Berkeley) 6/9/93
39 .Nd alter priority of running processes
61 scheduling priority of one or more running processes.
64 parameters are interpreted as process ID's, process group
67 a process group causes all processes in the process group
68 to have their scheduling priority altered.
70 a user causes all processes owned by the user to have
71 their scheduling priority altered.
72 By default, the processes to be affected are specified by
78 .It Fl n, Fl Fl priority
81 of the process, process group, or user.
85 parameters to be interpreted as process group ID's.
89 parameters to be interpreted as user names.
93 interpretation to be (the default) process ID's.
94 .It Fl v, Fl Fl version
102 renice +1 987 -u daemon root -p 32
105 would change the priority of process ID's 987 and 32, and
106 all processes owned by users daemon and root.
108 Users other than the super-user may only alter the priority of
110 and can only monotonically increase their ``nice value''
111 within the range 0 to
114 (This prevents overriding administrative fiats.)
116 may alter the priority of any process
117 and set the priority to any value in the range
122 Useful priorities are:
123 20 (the affected processes will run only when nothing else
124 in the system wants to),
125 0 (the ``base'' scheduling priority),
126 anything negative (to make things go very fast).
128 .Bl -tag -width /etc/passwd -compact
130 to map user names to user ID's
136 Non super-users can not increase scheduling priorities of their own processes,
137 even if they were the ones that decreased the priorities in the first place.
139 The Linux kernel (at least version 2.0.0) and linux libc (at least
140 version 5.2.18) does not agree entirely on what the specifics of the
141 systemcall interface to set nice values is. Thus causes renice to
142 report bogus previous nice values.
149 The renice command is part of the util-linux-ng package and is available from
150 ftp://ftp.kernel.org/pub/linux/utils/util-linux-ng/.