What is the command to terminate all processes in Linux?

The command to close all processes in Linux is killall. Its usage is as follows:

killall [选项] 进程名

When using the killall command, you can specify the process name to close a specific process. If no process name is specified, the killall command will close all processes. Please be aware that closing all processes may cause system issues, so consider carefully before using it. Also, using the killall command requires sufficient permissions.