#Bash 的 nice 命令

nice [OPTION] [COMMAND [ARG]...]

功能

运行命令时附带调度优先级。

类型

可执行文件（/usr/bin/nice），属于 coreutils。

参数

OPTION 选项：
- -n, --adjustment=N - 将优先级设为 N；范围是 [-20, 19]，数值越小越优先，默认为 10
- --help - 显示帮助
- --version - 显示版本
COMMAND - 要运行的命令；如果不传递此参数则打印当前优先级
ARG - 传递给 COMMAND 的参数列表

#示例

$ nice                          # 查看直接运行命令的优先级（通常是 0）
0
$ nice my_cmd                   # 默认将优先级设为 10，低于直接运行命令的优先级
$ sudo nice -n -20 my_cmd       # 默认将优先级设为 -20，只有 root 用户才能提高优先级（小于 0）

#推荐阅读

#手册

NICE(1)                          User Commands                         NICE(1)

NAME
       nice - run a program with modified scheduling priority

SYNOPSIS
       nice [OPTION] [COMMAND [ARG]...]

DESCRIPTION
       Run  COMMAND  with an adjusted niceness, which affects process schedul‐
       ing.  With no COMMAND, print the  current  niceness.   Niceness  values
       range  from  -20 (most favorable to the process) to 19 (least favorable
       to the process).

       Mandatory arguments to long options are  mandatory  for  short  options
       too.

       -n, --adjustment=N
              add integer N to the niceness (default 10)

       --help display this help and exit

       --version
              output version information and exit

       NOTE: your shell may have its own version of nice, which usually super‐
       sedes  the  version described here.  Please refer to your shell's docu‐
       mentation for details about the options it supports.

   Exit status:
       125    if the nice command itself fails

       126    if COMMAND is found but cannot be invoked

       127    if COMMAND cannot be found

       -      the exit status of COMMAND otherwise

AUTHOR
       Written by David MacKenzie.

REPORTING BUGS
       GNU coreutils online help: <https://www.gnu.org/software/coreutils/>
       Report any translation bugs to <https://translationproject.org/team/>

COPYRIGHT
       Copyright © 2023 Free Software Foundation, Inc.   License  GPLv3+:  GNU
       GPL version 3 or later <https://gnu.org/licenses/gpl.html>.
       This  is  free  software:  you  are free to change and redistribute it.
       There is NO WARRANTY, to the extent permitted by law.

SEE ALSO
       nice(2), renice(1)

       Full documentation <https://www.gnu.org/software/coreutils/nice>
       or available locally via: info '(coreutils) nice invocation'

GNU coreutils 9.4                 April 2024                           NICE(1)

#Bash 的 nice 命令

#示例

#推荐阅读

#手册

显示