killall sends a SIGTERM signal (if signal name is not specified explicitly) to all processes running any of the specified commands.
[Syntax]
killall [options] command
killall supports regular expression matching of process names, via the -r option.
If the specified command contains slash (/) characters, the command is interpreted as a file name and processes running that particular file will be selected as signal recipients.
To make the killall operation interactive you can provide -i option which makes killall prompt for confirmation before sending signal.
Signals are software interrupts sent to a program to indicate that an important event has occurred.
You can use the options -s, --signal, and -SIGNAL options to send explicit signals.
[Example]
killall -s 9 chrome
killall -SIGKILL python
Some common signals :
SIGINT 2 - Issued if the user sends an interrupt signal (Ctrl + C).
SIGQUIT 3 - Issued if the user sends a quit signal (Ctrl + D).
SIGKILL 9 - If a process gets this signal it must quit immediately and will not perform any clean-up operations.
