changes group ownership of all files/dirs in /path/to/dir to a project group [projgroup] and then gives the sgid bit to directories in that tree - all subsequently created files will inherit [projgroup]'s gid.
It's change the group id of all the files on your system that have the OLDGID group as the owner group by the new NEWGID. But first do this:
Document which files will be changed, use:
find / -gid OLDGID ! -type l > resplado-gid.txt
Be sure to disconnect users from the old group.
Stop demons or services associated with the group.
Be sure the new group exist and take note of GID
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