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In early days of computing, instruction are provided using binary language, which is difficult for all of us, to read and write. So in Os there is special program called Shell. Shell accepts your instruction or commands in English (mostly) and if its a valid command, it is pass to kernel. Shell is a user program or it’s environment provided for user interaction. Shell is an command language interpreter that executes commands read from the standard input device (keyboard) or from a file. How to use Shell To use shell (You start to use your shell as soon as you log into your system) you have to simply type commands. Normally shells are interactive. It means shell accept command from you (via keyboard) and execute them. But if you use command one by one (sequence of ‘n’ number of commands) , the you can store this sequence of command to text file and tell the shell to execute this text file instead of entering the commands. In this tutorial you are introduce to shell programming, how to write script, execute them etc. We will getting started with writing small shell script, that will print “Knowledge is Power” on screen.NOTE In the last syntax ./ means current directory, But only . (dot) means execute given command file in current shell without starting the new copy of shell, The syntax for . (dot) command is as follows Syntax . command-name. How to define User defined variables, Rules for Naming variable name (Both UDV and System Variable). How to print or access value of UDV. More command on one command line.
Tags : command language interpreter, linux shell, standard input device, shell scripting, shell script, udv, knowledge is power, variable name, shells, kernel, keyboard, syntax, variables, interaction, linux
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