Shell Programming

                              SHELL PROGRAMMING

When a group of commands has to be executed regularly, they should be stored in a file,

and the file itself executed as a shell script or shell program. Though it’s not mandatory,

we normally use .sh extension for shell scripts.

A shell program runs in interpretive mode. It is not compiled into a separate executable file as a C program is. Each statement is loaded into memory when it is to be executed.

Installing any Ubuntu/Linux package using the command:

sudo apt-get install [package_name]

Ex: 

       To install gedit editor

          >-sudo apt-get install gedit

      Creating a file in gedit editor

          >-sudo gedit [file_name]

      Ex:

          >- sudo gedit shell_program_1.sh

Few Examples Of Shell Codes:

1

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shell_program_1.sh

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	#!/bin/bash
	#Program: execute simple command
	echo "Today's date: `date`"

view raw shell_program_1.sh hosted with ❤ by GitHub

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For Execute Type: 

>-sh shell_program_1.sh 

in the Terminal.

2

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shell_program_2.sh

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	#!/bin/bash/
	#Program: execute simple commands
	echo "This month calender: \n"
	cal feb 2019
	echo "My shell is : $SHELL"

view raw shell_program_2.sh hosted with ❤ by GitHub

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Execute: sh shell_program_2.sh

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In the Next Blog, We will Discuss Some more Shell Codes.