HowToCodePage

Bash Scripting

Automating everyday command-line work.

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This course has 3 lessons. Start with the first one and use the next / previous links at the bottom of each lesson — the sidebar keeps the whole course in order.

Lessons

  1. Variables, quoting and exit codesAssign and expand values safely, understand word splitting, and read the status a command returns.
  2. Conditionals and loopsBranch on files, strings and numbers, match patterns with case, and iterate over lines without breaking on spaces.
  3. Writing a robust scriptStrict mode, traps that clean up after a crash, and argument parsing that fails with a useful message.

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Last refreshed 2026-09-17.