This should resolve "command 'grep' function is incomplete, please install the full version first." as BSD systems use ggrep for GNU grep
Use md5 -r as md5sum for macOS systems
This should resolve conflicts while installing "md5sha1sum" and "coreutils" together via brew, as they both providing "md5sum" binary, none of them are required now
Use ggrep as grep for BSD systems
Use md5 -r as md5sum for macOS systems