Linux 之 skill 命令

..note::
江山代有才人出，各领风骚数百年。
赵翼《论诗五首·其二》

Linux skill命令送个讯号给正在执行的程序，预设的讯息为 TERM (中断)，较常使用的讯息为 HUP、INT、KILL、STOP、CONT 和 0。

讯息有三种写法：分别为 -9、-SIGKILL、-KILL，可以使用 -l 或 -L 已列出可使用的讯息。

官方含义为：

skill, snice - send a signal or report process status

语法

1 2	$ skill [signal] [options] expression $ snice [new priority] [options] expression

一般参数：

-i, --interactive ：交互模式,每个动作将要被确认
-l, --list ：列出所有的信号
-L, --table ：列出所有的信号名

列出所有的信号

1
2
3

$ skill -l
HUP INT QUIT ILL TRAP ABRT BUS FPE KILL USR1 SEGV USR2 PIPE ALRM TERM STKFLT
CHLD CONT STOP TSTP TTIN TTOU URG XCPU XFSZ VTALRM PROF WINCH POLL PWR SYS

用漂亮的表格列出所有的信号

$ skill -L
 1 HUP      2 INT      3 QUIT     4 ILL      5 TRAP     6 ABRT     7 BUS
 8 FPE      9 KILL    10 USR1    11 SEGV    12 USR2    13 PIPE    14 ALRM
15 TERM    16 STKFLT  17 CHLD    18 CONT    19 STOP    20 TSTP    21 TTIN
22 TTOU    23 URG     24 XCPU    25 XFSZ    26 VTALRM  27 PROF    28 WINCH
29 POLL    30 PWR     31 SYS

kill掉用户users在PTY的进程

1	$ skill -KILL -t /dev/pts/*

停止三个使用者 user1、user2、user3

1	$ skill -STOP -u user1 -u user2 -u user3

相关命令

:ref:kill<linux-beginner-kill>
:ref:killall<linux-beginner-killall>
:ref:nice<linux-beginner-nice>
:ref:pkill<linux-beginner-pkill>
:ref:renice<linux-beginner-renice>
:ref:signal<linux-beginner-signal>

OPTIONS

PROCESS SELECTION OPTIONS
Selection criteria can be: terminal, user, pid, command. The options below may be used to ensure correct interpretation.

   -t, --tty tty
          The next expression is a terminal (tty or pty).

   -u, --user user
          The next expression is a username.

   -p, --pid pid
          The next expression is a process ID number.

   -c, --command command
          The next expression is a command name.

   --ns pid
          Match the processes that belong to the same namespace as pid.

   --nslist ns,...
          list which namespaces will be considered for the --ns option.  Available namespaces: ipc,  mnt,  net,  pid,  user,
          uts.

SIGNALS
The behavior of signals is explained in signal(7) manual page.

EXAMPLES
snice -c seti -c crack +7
Slow down seti and crack commands.