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Download free Linux/Unix Shell Scripting.pdf
What is shell ?

  • User talks to shell.
  • Shell talks to kernel.
  • Kernel talks to hardware.
  • Hardware does the job.
Shell (cont.)
  • You can write commands or write shell scripts.
  • Shell programs are called shell scripts.
  • Many Unix administrative programs are written as shell scripts.
  • A Unix shell is actually an interpreter of a programming language.
Shell script
Script is a text file that has:
–Shell commands.
–Control structures.
There are many shells available:
To see a full list of your valid shells:
–$cat /etc/shells


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