su - run a shell with substitute user and group IDs Format: su [options] [-] [user] [USER [ARG]...]
Eg1:su - tom
Here it switches to the user tom from the current user.
ls – list directory contents. ...
tail – print the last 10 lines of the named file.If more than one file is specified...
du- estimates the file space usage. Format: du [options] [file]...
grep- search one or more files that matches a regular pattern Format:...
cp - copy files and directories. Format: cp [options] source...
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