Today, an easy one.
In old unix books we still find sample chown syntax using a dot separator instead of a colon :
$ chown user.group file
This method can still be used, however the colon one is preferred. This can tell you who learned unix using old books ;-)
Another interesting thing with chown is :
$ chown user: file
This set the owner of file to user and the owner group to the natural group of user, which is the one defined in /etc/passwd. That's a word you don't have to type (and/or to look for).
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