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renice.1 (3149B)

      1 .TH RENICE 1 renice-VERSION "Jun 2013"
      2 .SH NAME
      3 renice \- set nice values of running processes
      4 .SH "SYNOPSIS"
      5 .PP
      6 .B renice
      7 .B \-n
      8 .I increment
      9 [
     10 .B \-g
     11 |
     12 .B \-p
     13 |
     14 .B \-u
     15 ]
     16 .I ID...
     18 The
     19 .B renice
     20 utility requests that the nice values of one or more
     21 running processes be changed. By default, the applicable processes
     22 are specified by their process IDs. When a process group is specified
     23 (see
     24 .B -g
     25 ), the request applies to all processes in the process group. If the
     26 requested increment would raise or lower the nice value of the
     27 executed utility beyond its limits, then the limit whose value was
     28 exceeded is used. When a user is reniced, the request applies to all
     29 processes whose saved set-user-ID matches the user ID corresponding to
     30 the user. Regardless of which options are supplied or any other factor,
     31 renice does not alter the nice values of any process unless the user
     32 requesting such a change has appropriate privileges to do so for the
     33 specified process. If the user lacks appropriate privileges to perform
     34 the requested action, the utility returns an error status.
     35 The saved set-user-ID of the user's process is checked instead of its
     36 effective user ID when renice attempts to determine the user ID of the
     37 process in order to determine whether the user has appropriate privileges.
     38 .SH OPTIONS
     39 .TP
     40 .B \-g
     41 interpret all operands as unsigned decimal integer process group IDs.
     42 .TP
     43 .B \-n
     44 .I increment
     45 specify how the nice value of the specified process or processes
     46 is to be adjusted. The increment option-argument is a positive or
     47 negative decimal integer used to modify the nice value of the
     48 specified process or processes. positive increment values cause a
     49 lower nice value. Negative increment values may require appropriate
     50 privileges and cause a higher nice value.
     51 .TP
     52 .B \-p
     53 interpret all operands as unsigned decimal integer process IDs.
     54 The
     55 .B \-p
     56 option is the default if no options are specified.
     57 .TP
     58 .B \-u
     59 interpret all operands as users. If a user exists with a user name
     60 equal to the operand, then the user ID of that user is used in further
     61 processing. Otherwise, if the operand represents an unsigned decimal
     62 integer, used as the numeric user ID of the user.
     64 On successful completion 0 is returned, a value which is >0 is
     65 returned on error.
     66 .SH FILES
     67 .TP
     68 .I /etc/passwd
     69 used to map user names to user ID's.
     71 The
     72 .B renice
     73 utility is IEEE Std 1003.1-2001 (POSIX.1) compatible.
     74 .SH EXAMPLES
     75 .TP
     76 .I "renice -n 5 -p 987 32"
     77 .PP
     78 Adjust the nice value so that process IDs 987 and 32 would have a
     79 lower nice value.
     80 .TP
     81 .I "renice -n -4 -g 324 76"
     82 .PP
     83 Adjust the nice value so that group IDs 324 and 76 would have a
     84 higher nice value, if the user has the appropriate privileges to do so.
     85 .TP
     86 .I "renice -n 4 -u 8 sas"
     87 .PP
     88 Adjust the nice value so that numeric user ID 8 and user sas would
     89 have a lower nice value.
     90 Useful nice value increments on historical systems include
     91 19 or 20 (the affected processes run only when nothing else in the
     92 system attempts to run) and any negative number
     93 (to make processes run faster).
     94 .SH AUTHOR
     95 Written by Lorenzo Cogotti.
     96 .SH SEE ALSO
     97 .BR nice(1)