killall: add page (#1317)

pages/common/killall.md

@@ -0,0 +1,24 @@
+# killall
+
+> Send kill signal to all instances of a process by name (must be exact name).
+> All signals except SIGKILL and SIGSTOP can be intercepted by the process, allowing a clean exit.
+
+- Terminate a process using the default SIGTERM (terminate) signal:
+
+`killall {{process_name}}`
+
+- List available signal names (to be used without the 'SIG' prefix):
+
+`killall --list`
+
+- Interactively ask for confirmation before termination:
+
+`killall -i {{process_name}}`
+
+- Terminate a process using the SIGINT (interrupt) signal, which is the same signal sent by pressing `Ctrl+C`:
+
+`killall -INT {{process_name}}`
+
+- Force kill a process:
+
+`killall -KILL {{process_name}}`