Linux › Section B · Basic commands and the directory hierarchy › Topic B.5

Dot files, environment variables, and the command path

Your shell carries settings with it: hidden configuration files in your home directory, variables that shape how programs behave, and a search path that decides which program a command name runs. Understanding them explains many puzzling "command not found" moments.

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In this topic

Your password and your shell
Dot files
Shell variables
Environment variables and export
Worked example: shell or environment?
The command path
Changing PATH safely
Worked example: running your own script
type, which and alias
Common mistakes to avoid
Key takeaways

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