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(1) What is a shell script

• A text file containing commands which could have been typed directly into the shell.

• The shell itself has limited capabilities -- the power comes from using it as a "glue" language to combine the standard Unix utilities, and custom software, to produce a tool more useful than the component parts alone.

• Any shell can be used for writing a shell script. To allow for this, the first line of every script is:
  #!/path/to/shell (e.g. #!/bin/ksh).

• Any file can be used as input to a shell by using the syntax:
  ksh myscript

• If the file is made executable using chmod, it becomes a new command and available for use (subject to the usual $PATH search).
  chmod +x myscript

Example: ex0 display, text