130 lines
3.2 KiB
Markdown
130 lines
3.2 KiB
Markdown
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# The `killall` command
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`killall` sends a signal to **all** processes running any of the specified commands. If no signal name is specified, `SIGTERM` is sent. In general, `killall` command kills all processes by knowing the name of the process.
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Signals can be specified either by name (e.g. `-HUP` or `-SIGHUP`) or by number (e.g. `-1`) or by option `-s`.
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If the command name is not a regular expression (option `-r`) and contains a slash (`/`), processes executing that particular file will be selected for killing, independent of their name.
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`killall` returns a zero return code if at least one process has been killed for each listed command, or no commands were listed and at least one process matched the `-u` and `-Z` search criteria. `killall` returns non-zero otherwise.
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A `killall` process never kills itself (but may kill other `killall` processes).
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### Examples:
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1. Kill all processes matching the name `conky` with `SIGTERM`:
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```sh
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killall conky
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# OR
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killall -SIGTERM conky
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# OR
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kilall -15 conky
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```
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I was able to kill Wine ( which are Windows exe files running on Linux ) applications this way too.
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```sh
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killall TQ.exe
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```
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2. List all the supported signals:
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```sh
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$ killall -l
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HUP INT QUIT ILL TRAP ABRT BUS FPE KILL USR1 SEGV USR2 PIPE ALRM TERM STKFLT
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CHLD CONT STOP TSTP TTIN TTOU URG XCPU XFSZ VTALRM PROF WINCH POLL PWR SYS
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```
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As for the numbers.
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```sh
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$ for s in $(killall -l); do echo -n "$s " && kill -l $s; done
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HUP 1
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INT 2
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QUIT 3
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ILL 4
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TRAP 5
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ABRT 6
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BUS 7
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FPE 8
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KILL 9
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USR1 10
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SEGV 11
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USR2 12
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PIPE 13
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ALRM 14
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TERM 15
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STKFLT 16
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CHLD 17
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CONT 18
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STOP 19
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TSTP 20
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TTIN 21
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TTOU 22
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URG 23
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XCPU 24
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XFSZ 25
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VTALRM 26
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PROF 27
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WINCH 28
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POLL 29
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PWR 30
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SYS 31
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```
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3. Ask before killing, to prevent unwanted kills:
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```sh
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$ killall -i conky
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Kill conky(1685) ? (y/N)
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```
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4. Kill all processes and wait until the processes die.
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```sh
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killall -w conky
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```
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5. Kill based on time:
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```sh
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# Kill all firefox younger than 2 minutes
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killall -y 2m firefox
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# Kill all firefox older than 2 hours
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killall -o 2h firefox
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```
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### Syntax:
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```sh
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killall [OPTION]... [--] NAME...
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killall -l, --list
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killall -V, --version
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```
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### Additional Flags and their Functionalities:
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|**Short Flag** |**Long Flag** |**Description** |
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|:---|:---|:---|
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|`-e`|`--exact`|require an exact match for very long names|
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|`-I`|`--ignore-case`|case insensitive process name match|
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|`-g`|`--process-group`|kill process group instead of process|
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|`-y`|`--younger-than`|kill processes younger than TIME|
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|`-o`|`--older-than`|kill processes older than TIME|
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|`-i`|`--interactive`|ask for confirmation before killing|
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|`-l`|`--list`|list all known signal names|
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|`-q`|`--quiet`|don't print complaints|
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|`-r`|`--regexp`|interpret NAME as an extended regular expression|
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|`-s`|`--signal SIGNAL`|send this signal instead of SIGTERM|
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|`-u`|`--user USER`|kill only process(es) running as USER|
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|`-v`|`--verbose`|report if the signal was successfully sent|
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|`-w`|`--wait`|wait for processes to die|
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|`-n`|`--ns PID`|match processes that belong to the same namespaces as PID
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|`-Z`|`--context`|REGEXP kill only process(es) having context (must precede other arguments)
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### Related commands
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[kill](/ebook/en/content/034-the-kill-command.md), `pidof`
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