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Environment Variables

4 min read Quiz at the end

Environment variables store configuration. echo $PATH shows the search path. export VAR=value sets one for the current session. Add exports to ~/.bashrc to make them permanent. source ~/.bashrc applies changes.

Environment Variables

echo $HOME         # /home/alice
echo $PATH         # executable search path
echo $USER         # alice

# Set for session
export MY_VAR="hello"

# Set permanently
echo 'export MY_VAR="hello"' >> ~/.bashrc
source ~/.bashrc

# List all variables
printenv
env

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Environment Variables

Environment Variables