Ubuntu under Su and Su-command brief analysis

The commands for switching users in Linux are Su or Su-.

The most essential difference between the SU command and the Su-command is that the former simply switches the root identity, but the shell environment is still the shell of the normal user, and the user and the shell environment are switched to root.

After switching, you can use PWD to view the current working directory, or you can use the Echo $PATH to look at the environment variables and observe the differences between Su and Su.

When we switch users, we should use su-, which is the same when switching other users, such as to switch other users can refer to Su-fmaster to enter the command line.

Ubuntu under Su and Su-command brief analysis