What do compat mean in name service switch? /etc/nsswitch.conf
Compat is used to support the +/- features of
group local files. Historically if you wanted to include information from a different source e.g. NIS, you could put an entry in your password/group file
+@netgroup which would cause the information for
netgroup to be read from NIS. Mostly a single
+ was put at the end of the file to indicate that the whole NIS map should be used.
With NSS this is no longer required as you can now just specify the data sources in
passwd: files nisplus nis