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docs/Linux-Commands/Process-Management/035-the-killall-command.md

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+# The `killall` command
+
+`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.
+
+Signals can be specified either by name (e.g. `-HUP` or `-SIGHUP`) or by number (e.g. `-1`) or by option `-s`.
+
+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.
+
+`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.
+
+A `killall` process never kills itself (but may kill other `killall` processes).
+
+### Examples:
+
+1. Kill all processes matching the name `conky` with `SIGTERM`:
+
+```sh
+killall conky
+# OR
+killall -SIGTERM conky
+# OR
+kilall -15 conky
+```
+
+I was able to kill Wine ( which are Windows exe files running on Linux ) applications this way too.
+
+```sh
+killall TQ.exe
+```
+
+2. List all the supported signals:
+
+```sh
+$ killall -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
+```
+
+As for the numbers.
+
+```sh
+$ for s in $(killall -l); do echo -n "$s " && kill -l $s; done
+HUP 1
+INT 2
+QUIT 3
+ILL 4
+TRAP 5
+ABRT 6
+BUS 7
+FPE 8
+KILL 9
+USR1 10
+SEGV 11
+USR2 12
+PIPE 13
+ALRM 14
+TERM 15
+STKFLT 16
+CHLD 17
+CONT 18
+STOP 19
+TSTP 20
+TTIN 21
+TTOU 22
+URG 23
+XCPU 24
+XFSZ 25
+VTALRM 26
+PROF 27
+WINCH 28
+POLL 29
+PWR 30
+SYS 31
+```
+
+3. Ask before killing, to prevent unwanted kills:
+
+```sh
+$ killall -i conky
+Kill conky(1685) ? (y/N)
+```
+
+4. Kill all processes and wait until the processes die.
+
+```sh
+killall -w conky
+```
+
+5. Kill based on time:
+
+```sh
+# Kill all firefox younger than 2 minutes
+killall -y 2m  firefox
+
+# Kill all firefox older than 2 hours
+killall -o 2h  firefox
+```
+
+### Syntax:
+
+```sh
+killall [OPTION]... [--] NAME...
+killall -l, --list
+killall -V, --version
+```
+
+### Additional Flags and their Functionalities:
+
+|**Short Flag**   |**Long Flag**   |**Description**   |
+|:---|:---|:---|
+|`-e`|`--exact`|require  an  exact  match for very long names|
+|`-I`|`--ignore-case`|case insensitive process name match|
+|`-g`|`--process-group`|kill process group instead of process|
+|`-y`|`--younger-than`|kill processes younger than TIME|
+|`-o`|`--older-than`|kill processes older than TIME|
+|`-i`|`--interactive`|ask for confirmation before killing|
+|`-l`|`--list`|list all known signal names|
+|`-q`|`--quiet`|don't print complaints|
+|`-r`|`--regexp`|interpret NAME as an extended regular expression|
+|`-s`|`--signal SIGNAL`|send this signal instead of SIGTERM|
+|`-u`|`--user USER`|kill only process(es) running as USER|
+|`-v`|`--verbose`|report if the signal was successfully sent|
+|`-w`|`--wait`|wait for processes to die|
+|`-n`|`--ns PID`|match processes that belong to the same namespaces as PID
+|`-Z`|`--context`|REGEXP kill only process(es) having context (must precede other arguments)
+
+### Related commands
+
+[kill](/ebook/en/content/034-the-kill-command.md), `pidof`