I recently tried using the newgrp command (just for kicks) and it
aborted killing the window in which I invoked it. I couldn't find a man page
for newgrp (though I did find it in O'Reilly's "UNIX in a Nutshell"). This
has led me to question how groups are used in UNIX .
Say I belong to 3 groups. When I log in, I presume all 3 group names
are associated with me, since I don't see any of them associated with my line
in /etc/passwd . Then if I try to access a file which I don't own, the file
system checks to see the group that owns it is any of the ones to which I
belong, and if so that access prevails. Otherwise, the access for "other"
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