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# Linux skill command [ Linux Command Manual](#) The Linux skill command sends a signal to a running program. The default signal is TERM (terminate). More commonly used signals are HUP, INT, KILL, STOP, CONT, and 0. Signals can be written in three ways: -9, -SIGKILL, -KILL. You can use -l or -L to list available signals. Permissions: All users. Other related commands: kill ### Syntax skill rules for selecting processes **General Options**: * -f Fast mode / not yet implemented * -i Interactive mode / each action will be confirmed * -v Verbose output / list information about selected processes * -w Smart warning messages / not yet implemented * -n No action / display process ID **Parameters**: Rules for selecting processes can be: terminal ID, username, process ID, command name. * -t Terminal ID (tty or pty) * -u Username * -p Process ID (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/Force close | | PIPE 13 | Exit | | POLL | Exit | | PROF | Exit | | TERM 15 | Exit | | USR1 | Exit | | USR2 | Exit | | VTALRM | Exit | | STKFLT | Exit/Only for i386, m68k, arm, and ppc hardware | | UNUSED | Exit/Only for i386, m68k, arm, and ppc hardware | | TSTP | Stop/Generate context-related behavior | | TTIN | Stop/Generate context-related behavior | | TTOU | Stop/Generate context-related behavior | | STOP | Stop/Force close | | CONT | Restart/If in stopped state, restart; otherwise, ignore | | PWR | Ignore/On some systems, will exit | | WINCH | Ignore | | CHLD | Ignore | | ABRT 6 | Core | | FPE 8 | Core | | ILL 4 | Core | | QUIT 3 | Core | | SEGV 11 | Core | | TRAP 5 | Core | | SYS | Core/Maybe not implemented | | EMT | Core/Maybe not implemented | | BUS | Core/Core failure | | XCPU | Core/Core failure | | XFSZ | Core/Core failure | ### Examples Stop all programs on PTY devices skill -KILL -v pts/* Stop three users user1, user2, user3 skill -STOP user1 user2 user3 [ Linux Command Manual](#)