How to run spell check on multiple files and display any incorrect words in shell script?

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You can install aspell with Homebrew on OS X. brew info aspell lists supported languages.

brew install aspell --lang=en,fi,jp

aspell check opens a file in an interactive spell checker:

for f in *.txt; do aspell check $f; done

aspell list prints all unrecognized words:

cat *.txt | aspell list | sort -u

Learned words are stored in .aspell.en.pws by default. You can also exclude words in ~/Library/Spelling/en after adding personal_ws-1.1 en as the first line.

aspell list --personal=$HOME/Library/Spelling/en

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