How to Write Shell Script

Kunal 3:06 am on December 15, 2009 | Answers: 1    
Tags: linux (87), script (32), scripting (2), shell (15), unix (46)

Rate Knowledge:

 Loading ...

• Abhay 3:06 am on December 15, 2009
  

  Following steps are required to write shell script:

  (1) Use any editor like vi to write shell script.
  (2) After writing shell script set execute permission for your script as follows
  syntax:

  chmod permission your-script-name

  Examples:

  $ chmod +x your-script-name
  $ chmod 755 your-script-name

  Note: This will set read write execute(7) permission for owner, for group and other permission is read and execute only(5).

  (3) Execute your script as
  syntax:

  bash your-script-name
  sh your-script-name

  ./your-script-name

  Examples:
  $ bash bar
  $ sh bar
  $ ./bar

  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

  Example:
  $ . foo

  Now you are ready to write first shell script that will print “Knowledge is Power” on screen. See the common vi command list , if you are new to vi.

  $ vi first
  #
  # My first shell script
  #
  clear
  echo “Knowledge is Power”

  After saving the above script, you can run the script as follows:

  $ ./first