Unix General Purpose Commands.

In this topic of discussion we would cover the following Unix General Purpose Commands.

1. man
2. cal
3. echo
4. bc
5. rev

1.MAN:-manual help of unix.

• How to get help for a command in unix os?

>man ps

(this will give you the manual help of how ps(process staus) command should be used in unix.it will also have the syntax of the command usage.)

2.CAL:- the calendar

This command is used to give the calender of a particluar month or year.

>cal [month] [year]

where [month] and [year] are optional.

>cal 03 2014

gives the calender of march 2014

>cal 

gives the calender of the current month

3.ECHO:-Displays a message

This command is used to display a particular message in unix.

>echo "message"

message

>echo $$

gives the currently running process.

4.BC:-Binary calculator

>bc 10+20

30

5.REV:- gives the reverse of the output.(Important asked in several interviews)

> echo "unix" | rev

xinu