Bash Shell Scripting - Environment Variables

This video tutorial introduces environment variables, demonstrating how to display, customize, and use them in scripts. It covers commands like 'env' and 'export', and explains how environment variables can be utilized in practical scenarios, such as working with software packages like Apache or Cassandra. The tutorial concludes with a summary and a preview of the next topic on shell variables.

What is the purpose of the shebang line in a script?

• To run the script with root privileges

• To display a welcome message

• To specify the script interpreter

• To set environment variables

Which command is used to display environment variables in the terminal?

• echo

• pwd

• env

• ls

Which environment variable would you use to find the current user's home directory?

• USER

• PWD

• HOME

• PATH

What does the 'export' command do in the context of environment variables?

• Deletes an environment variable

• Displays all environment variables

• Makes a variable part of the environment

• Lists all available commands

Which of the following is NOT a default environment variable?

• COURSE

• HOME

• LOGNAME

• SHELL

How can environment variables be useful when working with software like Apache or Cassandra?

• They allow you to avoid using scripts

• They help in setting up default directories

• They automatically update software

• They enable the use of predefined paths and settings

What is a classic use case for environment variables in scripting?

• To manage software deployment settings

• To replace shell commands

• To create new programming languages

• To automate hardware configurations