General Commands in UNIX

1. Date:- Used to display Date and Time

$ date

$ date + % option

$ date + % D -> MM/DD/YY

$ date + % a -> sat

$ date + % A -> saturday

$ date + % h -> Dec

$ date + % m -> 12 (Month)

$ date + % y -> 09 (Year)

$ date + % d -> 01 (Day)

$ date + % T -> HH.MI.SS

$ date + % H -> HH (Hours)

$ date + % M -> Mi (Minutes)

$ date + % S -> SS (Seconds)

$ date + % D%T -> MM/DD/YY HH:Mi:SS

$ date + "% D%T" -> MM/DD/YY - HH:Mi:SS

Note: UNIX is space sensitive and case sensitive.

2. Man:- $ man

                              ( It gives help about Command)

ex:- $ man date

3. cal:- used to display calender

$ cal

$ cal 12 2009            (cal MM YYYY)

$ cal 2009                 (cal YYYY)

ex:- $ cal 9 1752

4. Who:- gives the List of users who are currently working in Operating System

$ who -> gives all users details

$ who am I -> gives only user information

$ who-H -> gives display with headings

ex:- $ who

 user     TTYNo     Time     IPAddress

User1   TTY01     10:00      *****

$ who-H

Name    Line       Time

User1   TTY01   10:00

5. Write:- used to send Messages to other users

ex:-   user1                                       |      User2

                          $ Write user2                         |      Message from user1

                           .......................                         |      ...................................

                           .......................                                 ...................................

                           (ctrl+d)                                                   (ctrl+d)

Note:- (ctrl+d -> quit the message)