![Wall
Usually this wall command (write all) command is used by the super
user to send a message to all the users who were logged on the
system.
General format is,
Wall
<message>
<press [ctrl+d] at the end]
Example
$wall
Meeting at 14.00hrs
^d
The specified message “meeting 14.00hrs” will be displayed on
everyone’s terminal with a beep sound like write message .
5/19/2017 Bhatvijetha](https://image.slidesharecdn.com/linuxcommandspart4-170519100744/85/Linux-commands-part4-4-320.jpg)
![ Cal
This command will display calendar for the specified month
and year.
general format is,
Cal [<month>] <year>
Where ,month can be ranged from 1 to 12.
5/19/2017 Bhatvijetha](https://image.slidesharecdn.com/linuxcommandspart4-170519100744/85/Linux-commands-part4-9-320.jpg)
![ Lpr
This command is used to print one or more files on the printer.
General format is,
Lpr [options] <filename> <filename2>..<filenameN>
Where options can be,
r removes files from one directory after printing.
m Mail inform you when printing is over
5/19/2017 Bhatvijetha](https://image.slidesharecdn.com/linuxcommandspart4-170519100744/85/Linux-commands-part4-10-320.jpg)
Linux commands part4
- 1. COMMUNICATION ORIENTED COMMANDS GENERAL PURPOSE COMMANDS Bhat_ vijetha5/19/2017
- 2. Linux provides the communication facility from which a user communicate with the other users. The communication can be online or offline. In online communication , the user to whom the message was sent must be logged on to the system. In offline communication ,the recipient need not be logged on the system. Some of the communication oriented commands are: Write This online communication command lets you to write messages on another user’s terminal. 5/19/2017 Bhatvijetha
- 3. General format is Write <RecipientLoginName> <message> ^d Mail This command offers offline communication. General format is, Mail <username> <message> ^d 5/19/2017 Bhatvijetha
- 4. Wall Usually this wall command (write all) command is used by the super user to send a message to all the users who were logged on the system. General format is, Wall <message> <press [ctrl+d] at the end] Example $wall Meeting at 14.00hrs ^d The specified message “meeting 14.00hrs” will be displayed on everyone’s terminal with a beep sound like write message . 5/19/2017 Bhatvijetha
- 5. Date This command displays the system’s date and time. General format is, Date +<format> Where <format> can be, %H hour 00 to23 %I hour 00 to 12 %M minute 00 to 59 %S second 00 to 59 %D Date MM/DD/YY %TTime HH:MM:SS %w day of the week %r time in AM/PM %y last two digits of the year 5/19/2017 Bhatvijetha
- 6. Who Linux is a multi user operating system where several user can work on the system. This command is used to display the users who are logged on the system currently. General format is, Who The first column of the user represents the user names. The second column represents the corresponding terminal names and the remaining columns represents the time at which the users are logged on. 5/19/2017 Bhatvijetha
- 7. This command tells you who you are. (working on the current terminal) General format is, Who am I 5/19/2017 Bhatvijetha
- 8. Man This man command displays the syntax and details usage of the linux command which is supplied as an argument. General format is, Man <linuxcommand> 5/19/2017 Bhatvijetha
- 9. Cal This command will display calendar for the specified month and year. general format is, Cal [<month>] <year> Where ,month can be ranged from 1 to 12. 5/19/2017 Bhatvijetha
- 10. Lpr This command is used to print one or more files on the printer. General format is, Lpr [options] <filename> <filename2>..<filenameN> Where options can be, r removes files from one directory after printing. m Mail inform you when printing is over 5/19/2017 Bhatvijetha
- 11. Tee This command does the operation of pipe and redirection. It will send the output of a command into standard output as well to specified file. General format is, Command |tee <filename> The option –a can be used with the tee command which appends the output of the specific file . Other wise the file content will be overwritten. 5/19/2017 Bhatvijetha
- 12. Script This command stores login session into a specific file. All the operations that you have done are stored on that file. Start the login session by issuing the following command. $script Then do you operations and finally use the exit command to end script.then all the operation in between script and exit will be stored on a file named type script. The next script command will overwrite the typescript file. 5/19/2017 Bhatvijetha
- 13. Tput This command with clear option can be used to clear thee screen content. General format is, Tput clear You can also use clear command for this purpose. 5/19/2017 Bhatvijetha
- 14. Expr This command is used to perform arithematic operations on integers. A white space must be used on either side of an operator. $ x=5 $y=2 Then, $ expr $X + $y $ expr $x - $y 5/19/2017 Bhatvijetha
- 15. Bc This command is used to perform arithematic operations on integers as well as on floats. Type the arithematic expression in a line and press key. Then the answer will be displayed on the next line. After you have finished work,press control d to end up. Example: Add 10 and 20 $bc 10 + 20 30 Ctrl+d(to end) 5/19/2017 Bhatvijetha