Key Concepts

Review core concepts you need to learn to master this subject

Command line environment

Shell Command env

Alias

Environment Variables

Source Bash Profile

history Command

Export command

HOME Environment Variable in Unix Systems

Command line environment

The environment of the command line refers to the settings and preferences of the current user. It enables users to set greetings, alias commands, variables, and much more.

Environment
Lesson 1 of 1
  1. 1
    Intro to Environment
    Each time we launch the terminal application, it creates a new session. The session immediately loads settings and preferences that make up the command line environment. We can configure the env…
    Start
  2. 2
    Nano
    Nice job! You just edited a file in the nano text editor. How does it work? $ nano hello.txt nano is a command line text editor. It works the same way as a desktop text editor like TextEdit or…
    Start
  3. 3
    Bash Profile
    A bash profile is a file used to store environment settings for your terminal, and it’s accessible by the name ~/.bash_profile. When a session starts, it loads the contents of the bash profil…
    Start
  4. 4
    Aliases I
    As we mentioned in the last exercise, you can add settings and commands that execute every time a new terminal session is started. One type of setting you can create is called an alias: alias …
    Start
  5. 5
    Aliases II
    We can add as many aliases as we want in a bash profile. Here are two more examples: alias hy=”history” hy is set as an alias for the history command in the bash profile. The alias is then made…
    Start
  6. 6
    Environment Variables
    Environment variables are variables that can be used across commands and programs and hold information about the environment. What happens when you store this in ~/.bash_profile? export US…
    Start
  7. 7
    PS1 Environment Variable
    PS1 is an environment variable that defines the makeup and style of the command prompt. What happens when this is stored in ~/.bash_profile? export PS1=”>> “ 1. export PS1=”>> “ sets the co…
    Start
  8. 8
    HOME Environment Variable
    What happens when you type this command? $ echo $HOME The HOME variable is an environment variable that displays the path of the home directory ~. You can specify and change the HOME variable i…
    Start
  9. 9
    PATH Environment Variable
    PATH is an environment variable that stores a list of directories separated by a colon. What happens when you type this command? $ echo $PATH /home/ccuser/.gem/ruby/2.0.0/bin:/usr/local/sbin:/u…
    Start
  10. 10
    env
    The env command stands for “environment,” and returns a list of the environment variables for the current user. What happens when you type the env command? env The env command returns a number…
    Start
  11. 11
    Review
    Congratulations! You learned to use the bash profile to configure the environment. What can we generalize so far? * The environment refers to the preferences and settings of the current user. *…
    Start

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