Supplemental Note: Su allows users to temporarily change the identity of the login. Changes must be entered to change the user account and password.
Parameters: -c< instruction > or--command=< instruction > After executing the specified instruction, the original identity is restored. -F or--fast applies to csh and Tsch so that the shell does not have to read the startup file. -.-L or--login change the identity, also changes the working directory, as well as home,shell,user,logname. In addition, the path variable is changed. Do not change environment variables when-m,-p or--preserve-environment change identities. -s<shell> or--shell=<shell> Specifies the shell to execute. --help display Help. --version Displays version information. [user Account] Specifies the user to be changed. If you do not specify this parameter, the preset is changed to root.
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