Linux skill command

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The Linux skill command sends a signal to the running program, the default message is TERM (interrupt), and the commonly used messages are HUP, INT, KILL, STOP, CONT, and 0.

Messages have three writing styles:分别为 -9,-SIGKILL,-KILL, can be used -l Or -L The available messages have been listed.

Permission: All users.

Other related commands: kill

Syntax

skill [signal to send] [options] Select the rule of the program

General Parameters:

• -f Quick Mode/Not yet completed
• -i Interactive mode/ Each action will be confirmed
• -v Detailed output/ List information of selected programs
• -w Intelligent warning message/ Not yet completed
• -n No action/ Display program code

Parameters：The selection rules for the program can be: terminal code, user name, program code, command name.

• -t Terminal code (tty or pty)
• -u User name
• -p Program code (pid)
• -c Command name available signals

The following lists known signal names, signal codes, and functions.

Name (Code)	Function/Description
ALRM 14	Exit
HUP 1	Exit
INT 2	Exit
KILL 9	Exit/Forceful Shutdown
PIPE 13	Exit
POLL	Exit
PROF	Exit
TERM 15	Exit
USR1	Exit
USR2	Exit
VTALRM	Exit
STKFLT	Exit/Only applicable to i386、m68k, arm and ppc hardware
UNUSED	Exit/Only applicable to i386、m68k, arm and ppc hardware
TSTP	Stop/Generate content-related behavior
TTIN	Stop/Generate content-related behavior
TTOU	Stop/Generate content-related behavior
STOP	Stop/Forceful Shutdown
CONT	Restart/Restart if in stop state, otherwise ignore
PWR	Ignore/May exit in some systems
WINCH	Ignore
CHLD	Ignore
ABRT 6	Core
FPE 8	Core
ILL 4	Core
QUIT 3	Core
SEGV 11	Core
TRAP 5	Core
SYS	Core/May not have been implemented yet
EMT	Core/May not have been implemented yet
BUS	Core/Core Failure
XCPU	Core/Core Failure
XFSZ	Core/Core Failure

Online Examples

Stop all programs on PTY devices

skill -KILL -v pts/*

Stop three users user1、user2、user3

skill -STOP user1 user2 user3

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