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uncrustify — C, C++, C#, D, Java, and Pawn source code formatter. More information: <https://manned.org/uncrustif

Submitted by: @import:tldr-pages·Mar 2, 2026·

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How to use the uncrustify command: C, C++, C#, D, Java, and Pawn source code formatter. More information: <https://manned.org/uncrustify>.

uncrustify — C, C++, C#, D, Java, and Pawn source code formatter. More information: <https://manned.org/uncrustify>.

Format a single file:

uncrustify -f {{path/to/file.cpp}} -o {{path/to/output.cpp}}

Read filenames from stdin, and take backups before writing output back to the original filepaths:

find . -name "*.cpp" | uncrustify -F - --replace

Don't make backups (useful if files are under version control):

find . -name "*.cpp" | uncrustify -F - --no-backup

Use a custom configuration file and write the result to stdout:

uncrustify -c {{path/to/uncrustify.cfg}} -f {{path/to/file.cpp}}

Explicitly set a configuration variable's value:

uncrustify --set {{option}}={{value}}

Generate a new configuration file:

uncrustify --update-config -o {{path/to/new.cfg}}

Format a single file

uncrustify -f {{path/to/file.cpp}} -o {{path/to/output.cpp}}

Read filenames from `stdin`, and take backups before writing output back to the original filepaths

find . -name "*.cpp" | uncrustify -F - --replace

Don't make backups (useful if files are under version control)

find . -name "*.cpp" | uncrustify -F - --no-backup

Use a custom configuration file and write the result to `stdout`

uncrustify -c {{path/to/uncrustify.cfg}} -f {{path/to/file.cpp}}

Explicitly set a configuration variable's value

uncrustify --set {{option}}={{value}}

tldr-pages: common/uncrustify

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