Week_Three_Revision

Week_Three_Revision

1. Script Variables

   • Environment: A placeholder for data that can change - gets its value automatically from the OS startup or shell being used. E.G Home / Path: A placeholder for data that can change - value is assigned in a shell script. 
   • Direct Assignment = Specify the variable's value in the command. Value outputted via echo command.
   • Prompt Method = User is asked to enter a value for the variable
   • Positional Parameters = Parameter passed as argument to command.

2. Conditions

   • Tells the interpreter to skip commands based on a condition
   • If-Statement (Condition)
     • Completes certain commands based on testing a condition.
   • While Loop (Condition)
     • Repeats commands between DO and DONE statements as log as the tested condition is TRUE

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