What is difference between killall and kill command?

kill accepts process ID numbers as an argument, and only kills one process at a time (unless you specify multiple process IDs in your command) killall allows us to kill processes by name and will end all processes that have a matching name.

Does pkill kill all processes?

This command takes a pattern as the only required argument. That pattern will be matched against all process names, and the matching processes will be terminated.

What does pkill all do?

pkill (see pgrep) is a command-line utility initially written for use with the Solaris 7 operating system in 1998. As with the kill and killall commands, pkill is used to send signals to processes. The pkill command allows the use of extended regular expression patterns and other matching criteria.

What is the difference between kill process ID and kill process ID?

If kill receives a positive number, it kills the process with that ID. If we pass a negative number, it kills the process group with that PGID.

What signal does pkill?

SIGTERM
When no signal is included in the pkill command-line syntax, the default signal that is used is –15 (SIGTERM). Using the –9 signal (SIGKILL) with the pkill command ensures that the process terminates promptly.

Can we kill init process?

You can, loosely, kill init by issuing a kill -TERM 1 which would be analogous to issuing a halt or shutdown in that init will pass the signal to all children, essentially all other processes, before honoring the signal itself. Please note: performing this command will shutdown your system.

How do I stop a process using pkill?

How to Terminate a Process ( pkill )

1. (Optional) To terminate the process of another user, become superuser or assume an equivalent role.
2. Obtain the process ID for the process that you want to terminate. $ pgrep process.
3. Terminate the process. $ pkill [ signal ] process.
4. Verify that the process has been terminated.

How do you use pkill in Python?

Type the command sudo pkill python to kill all the Python processes running, regardless of the user who started the process. Type your password when prompted.

Does pkill send Sigterm?

When no signal is included in the pkill command-line syntax, the default signal that is used is –15 (SIGTERM). Using the –9 signal (SIGKILL) with the pkill command ensures that the process terminates promptly.