Calculator command, echo command, clear command, man command, pwd command, list command

 

6.’Basic’ Calculator Command :

It will change the „$‟ mode and in the new mode, arithmetic operations such as +,-,*,/,%,n,sqrt(),length(),=, etc can be performed . This command is used to go to the binary calculus mode.

Syntax :

 $bc operations

ibase –inputbase

obase – outputbase are used for base conversions.

Base :

                               Decimal = 1 Binary = 2 Octal = 8 Hexa = 16

 

7.Echo Command :

This command is used to print the arguments on the screen .

Syntax :$echo <text>

Multi line echo command :

To have the output in the same line , the following commands can be used.

Syntax :$echo <text\>text

To have the output in different line, the following command can be used.

Syntax :$echo “text

>line2

>line3”

Example: # echo "linoxide.com"
Output:              linoxide.com

 

8.’CLEAR’ Command :

It is used to clear the screen.

Syntax :$clear

Example:    #clear

Output:      Its clear all the screen.

 

9.’MAN’ Command :

It help us to know about the particular command and its options & working. It is like „help‟ command in windows .

Syntax :$man <command name>

Example:    man echo

Output:     echo command options & working details.

 

10.pwd command:

‘pwd’ command prints the absolute path to current working directory.

Example:#pwd
Output:          /home/raghu

11.LIST Command :

It is used to list all the contents in the current working directory.

Syntax :$ls – options <arguments>

If the command does not contain any argument means it is working in the Current directory.

Options :

a– used to list all the files including the hidden files.

c– list all the files columnwise.

d- list all the directories.

m- list the files separated by commas.

p- list files include „/‟ to all the directories.

r- list the files in reverse alphabetical order.

f- list the files based on the list modification date.

x-list in column wise sorted order.

l- displays a long listing of the files.

Example:ls -l

Output:      total 4
drwxr-xr-x 2 raghuraghu 4096 2012-07-06 12:52 example
                           -rw-r--r-- 1 raghuraghu 0 2012-07-06 12:52 file1.txt

-rw-r--r-- 1 raghuraghu 0 2012-07-06 12:52 file2.txt
-rw-r--r-- 1 raghuraghu 0 2012-07-06 12:52 file3.txt

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