Summary

To search for a file	find / -name filename -print
To search for text within a file	grep "text " filename
To see who is logged in	who
To find out more information about a user	finger username
To find out the time and date	date
To see a calendar	cal
To be reminded of appointments	Create a calendar file in your home directory
To use a calculator	bc calculator commands <Ctrl>D
To clear the screen	clear

For more information about	See
Searching for files	find(C)
Searching for text within files	grep(C)
Checking who is logged in	who(C)
Finding out more information about a user	finger(C)
Finding out the time and date	date(C)
Seeing a calendar	cal(C)
Using the calendar reminder service	calendar(C)
Using a calculator	bc(C)
Clearing the screen	clear(C)