Key Concepts

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Bash Scripts

Reusuable sets of bash terminal commands can be created using bash scripts. Bash scripts can run any command that can be run in a terminal.

Bash Shebang

Bash script files start with #!/bin/bash. This special line tells the computer to use bash as the intepreter.

Bash script comparison operators

In bash scripting, strings are compared using the == (Equal) and != (Not equal) operators.

bash script read keyword

The read command can be used to prompt the user for input. It will continue to read user input until the Enter key is pressed.

Some prompt text can also be specified using -p with the read command.

Bash Script Arguments

Arguments can be added to a bash script after the the script’s name. Once provided they can be accessed by using $(position in the argument list). For example, the first argument can be accessed with $1, the second with $2, the third with $3, etc.

Bash Aliases

Aliases can be created using the keyword alias. They are used to create shorter commands for calling bash scripts. They can also be used to call bash scripts with certain arguments.

Learn Bash Scripting
Lesson 1 of 1
  1. 1

    Bash (or shell) scripting is a great way to automate repetitive tasks and can save you a ton of time as a developer. Bash scripts execute within a Bash shell interpreter terminal. Any command you c…

  2. 2

    Within bash scripts (or the terminal for that matter), variables are declared by setting the variable name equal to another value. For example, to set the variable […] to “Hello”, you would use…

  3. 3

    When bash scripting, you can use conditionals to control which set of commands within the script run. Use […] to start the conditional, followed by the condition in square brackets ( […] ). …

  4. 4

    There are 3 different ways to loop within a bash script: […] , […] and […] . A for loop is used to iterate through a list and execute an action at each step. For example, if we had a lis…

  5. 5

    To make bash scripts more useful, we need to be able to access data external to the bash script file itself. The first way to do this is by prompting the user for input. For this, we use the […]…

  6. 6

    You can set up aliases for your bash scripts within your […] or […] file to allow calling your scripts without the full filename. For example, if we have our […] script, we can alias it…

  7. 7

    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 sp…

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