JOIN(1) JOIN(1) join - join []... 1 2 1 2 - - -a 1 2 1 2 -e '-12jo' -i, --ignore-case -j "-1 -2 " -o -t -v -a -1 1 -2 2 --check-order --nocheck-order --header -z, --zero-terminated NUL --help --version -t 1 ".""0" 1 2 "auto" 1 2 'join' "sort -k 1b,1" 'sort' "join -t ''""LC_COLLATE" Mike Haertel bug-coreutils@gnu.org GNU coreutils GNU (C) 2026 GPLv3+: GNU GPL 3 comm(1), uniq(1) info '(coreutils) join invocation' man man https://github.com/man-pages-zh/manpages- zh GNU coreutils 9.11 2026 JOIN(1)