aspell — Spell Check Text from the Command Line

aspell is a command-line spell checker. It is useful when editing plain text files, notes, documentation or scripts where you want a quick spelling pass without opening a full word processor.

Check a text file

aspell check notes.txt

This opens an interactive spelling session for the file.

List possible misspellings

aspell list < notes.txt

This prints words that aspell thinks may be incorrect. It is useful for quick checks in shell scripts or documentation workflows.