8

SHELL PROGRAMMING

Chapter Objectives
  • The meaning of variables and different types of shell variables
  • Writing shell scripts
  • Executing shell scripts
  • How to make shell scripts interactive using the read command
  • Positional parameters, their usage to read command line arguments and their manipulation
  • The exit status and performing various types of tests
  • Decision making and loop–control statements
  • Integer computing and string handling using expr
  • Performing real arithmetic
  • Debugging scripts
  • Recording a session using the script command
  • Having a working environment according one's taste using .profile

One of the important components of all Unix systems is the shell, which acts as a command processor as well as a programming language. We have ...

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