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chown trump: fileiftrumpis the primary group of usertrumpchown user.group filenameorchown .group filenamechownmanual states "Previous versions of the chown utility used the dot (.) character to distinguish the group name. This has been changed to be a colon (:) character, so that user and group names may contain the dot character." The RHEL man page forchowndoes not have that usage note. Nonetheless, there are reasons to abstain from using the.character.username:and:groupnameare not standards - see unix.stackexchange.com/a/136989/383045