As one other shortcut, it’s possible to tell chmod
“give users of one class the same permissions that some
other class has.”
Let’s say we have these files:
d------rwx joe acctg sales -rw-r--r-- joe acctg info.dat
The other users have full permissions on the sales
directory. We’d like to say “
the user and group should be assigned (=) the permissions
belonging to others.” That translates to:
chmod ug=o
Similarly, to make info.dat readable and writable to the
group, we can say:
chmod g=u info.dat
(you can read this as “the group is assigned (=) the permissions currently held by the user.”)
You may also use + and - to add and subtract the permissions that currently belong to a different class of user.
You can’t mix the standard permissions (r,
w, and x) with the coyping shortcuts.
chmod will protest if you give it something like this:
chmod g=wu info.dat
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