w - shows which all users logged in and what they are doing.
Format: w [options] [user]
Eg1: w tom
This will show the information about the user tom
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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