/usr/ is in checkstyle 6.15-1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/maven-repo/com/puppycrawl/tools/
/usr/share/maven-repo/com/puppycrawl/
/usr/share/
/usr/share/man/
/usr/share/man/man1/
/usr/share/man/man1/checkstyle.1.gz
/usr/share/checkstyle/
/usr/share/checkstyle/google_checks.xml
/usr/share/checkstyle/sun_checks.xml
/usr/share/java/
/usr/share/java/checkstyle.jar
/usr/share/maven-repo/
/usr/share/maven-repo/com/
/usr/share/maven-repo/com/puppycrawl/tools/checkstyle/
/usr/share/maven-repo/com/puppycrawl/tools/checkstyle/6.15/
/usr/share/maven-repo/com/puppycrawl/tools/checkstyle/6.15/checkstyle-6.15.pom
/usr/share/maven-repo/com/puppycrawl/tools/checkstyle/debian/
/usr/share/maven-repo/com/puppycrawl/tools/checkstyle/debian/checkstyle-debian.pom
/usr/share/doc/
/usr/share/doc/checkstyle/
/usr/share/doc/checkstyle/changelog.Debian.gz
/usr/share/doc/checkstyle/README.md.gz
/usr/share/doc/checkstyle/copyright
/usr/share/doc/checkstyle/README.Debian
/usr/bin/
/usr/bin/checkstyle
/usr/share/java/checkstyle-6.15.jar
/usr/share/maven-repo/com/puppycrawl/tools/checkstyle/6.15/checkstyle-6.15.jar
/usr/share/maven-repo/com/puppycrawl/tools/checkstyle/debian/checkstyle-debian.jar