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98 lines
3.1 KiB
Groff
98 lines
3.1 KiB
Groff
.TH PASTE 1 renice-VERSION "Jun 2013"
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.SH NAME
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renice \- set nice values of running processes
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.SH "SYNOPSIS"
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.PP
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.B renice
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.B \-n
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.I increment
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[
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.B \-g
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.B \-p
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.B \-u
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]
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.I ID...
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.SH DESCRIPTION
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The
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.B renice
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utility requests that the nice values of one or more
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running processes be changed. By default, the applicable processes
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are specified by their process IDs. When a process group is specified
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(see
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.B -g
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), the request applies to all processes in the process group. If the
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requested increment would raise or lower the nice value of the
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executed utility beyond its limits, then the limit whose value was
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exceeded is used. When a user is reniced, the request applies to all
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processes whose saved set-user-ID matches the user ID corresponding to
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the user. Regardless of which options are supplied or any other factor,
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renice does not alter the nice values of any process unless the user
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requesting such a change has appropriate privileges to do so for the
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specified process. If the user lacks appropriate privileges to perform
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the requested action, the utility returns an error status.
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The saved set-user-ID of the user's process is checked instead of its
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effective user ID when renice attempts to determine the user ID of the
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process in order to determine whether the user has appropriate privileges.
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.SH OPTIONS
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.TP
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.B \-g
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interpret all operands as unsigned decimal integer process group IDs.
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.TP
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.B \-n
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.I increment
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specify how the nice value of the specified process or processes
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is to be adjusted. The increment option-argument is a positive or
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negative decimal integer used to modify the nice value of the
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specified process or processes. positive increment values cause a
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lower nice value. Negative increment values may require appropriate
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privileges and cause a higher nice value.
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.TP
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.B \-p
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interpret all operands as unsigned decimal integer process IDs.
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The
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.B \-p
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option is the default if no options are specified.
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.TP
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.B \-u
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interpret all operands as users. If a user exists with a user name
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equal to the operand, then the user ID of that user is used in further
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processing. Otherwise, if the operand represents an unsigned decimal
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integer, used as the numeric user ID of the user.
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.SH EXIT VALUES
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On successful completion 0 is returned, a value which is >0 is
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returned on error.
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.SH FILES
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.TP
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.I /etc/passwd
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used to map user names to user ID's.
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.SH CONFORMING TO
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The
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.B renice
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utility is IEEE Std 1003.1-2001 (POSIX.1) compatible.
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.SH EXAMPLES
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.TP
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.I "renice -n 5 -p 987 32"
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.PP
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Adjust the nice value so that process IDs 987 and 32 would have a
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lower nice value.
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.TP
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.I "renice -n -4 -g 324 76"
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.PP
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Adjust the nice value so that group IDs 324 and 76 would have a
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higher nice value, if the user has the appropriate privileges to do so.
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.TP
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.I "renice -n 4 -u 8 sas"
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.PP
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Adjust the nice value so that numeric user ID 8 and user sas would
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have a lower nice value.
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Useful nice value increments on historical systems include
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19 or 20 (the affected processes run only when nothing else in the
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system attempts to run) and any negative number
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(to make processes run faster).
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.SH AUTHOR
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Written by Lorenzo Cogotti.
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.SH SEE ALSO
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.BR nice(1)
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