The killall command is used to send a signal to one or more processes on matching one of the following conditions:

• Command: Match exact process name
• Owner: Match exact name of the owner of the process
• All system: System-wide processes

Its syntax is as follows:

 $ killall    <process_name>
 $ killall   -<signal>    <process_name>
 $ killall   -<signal>   -u    <username>    <process_name>