The distinctions between Linux's "su" and "su -" commands are described by TecAdmin.
Difference Between `su` and `su -` Commands in Linux
In Linux, the `su` command allows a user to switch to a different user account. The `su` command can be followed by the name of the user to switch to, and will prompt the user for the password of the user they are trying to switch to. The `su` command has a number of options
