One Day One GNU/Linux Command
=============================
su -- Run a shell with Substitute User
Summary:
`su' allows one user to temporarily become another user. It runs a
command with the Real & Effective user id, group id and supplemental
groups of a given user. If user not given, it will login as root.
Examples:
$ su -- Run a new shell with root user.
$ su user1 -- Run a new shell with user1.
$ su -c ls -- Run the command with substitute user.
$ su -f user1 -- Fast login (skips startup files).
$ su -p user1 -- Preserve the environment variables.
$ su -l user1 -- Unset all env variables, change Home dir and run
shell startup files.
$ su -s /bin/csh -- Run csh shell instead of the user's default shell.
Read: man su
HTH :)
--
Bharathi S
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