What is Shell Script ?

• 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.
• Why to Write Shell Script ?
  • Shell script can take input from user, file and output them on screen.
  • Useful to create our own commands.
  • Save lots of time.
  • To automate some task of day today life.
  • System Administration part can be also automated.