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Learn Bash Scripting
Review

Take a minute to review what you’ve learned about bash scripting.

  • Any command that can be run in the terminal can be run in a bash script.
  • Variables are assigned using an equals sign with no space (greeting="hello").
  • Variables are accessed using a dollar sign (echo $greeting).
  • Conditionals use if, then, else, fi syntax.
  • Three types of loops can be used: for, while, and until.
  • Bash scripts use a unique set of comparison operators:
    • Equal: -eq
    • Not equal: -ne
    • Less than or equal: -le
    • Less than: -lt
    • Greater than or equal: -ge
    • Greater than: -gt
    • Is null: -z
  • Input arguments can be passed to a bash script after the script name, separated by spaces (myScript.sh “hello” “how are you”).
  • Input can be requested from the script user with the read keyword.
  • Aliases can be created in the .bashrc or .bash_profile using the alias keyword.

Instructions

Our completed script is in the code editor. Feel free to edit it to make it your own.

Some ideas:

  • ask the user for different greetings
  • add more than two greetings
  • add more conditions to adjust the greetings over time
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