Plan 9 from Bell Labs’s /usr/web/sources/patch/applied/sha2sum/files
/sys/man/1/INDEX INDEX /sys/man/1/sum sum /sys/src/cmd/sha224sum.c sha224sum.c /sys/src/cmd/sha256sum.c sha256sum.c /sys/src/cmd/sha384sum.c sha384sum.c /sys/src/cmd/sha512sum.c sha512sum.c