The Non-complexity of /etc/nsswitch.conf
In most glibc-based operating systems, there’s a file /etc/nsswitch.conf that most people ignore, few people understand, but all people generally rely on. This file determines where the system finds things like host names, passwords, and protocol numbers. Does your company use LDAP? NIS? Plain files? The nsswitch file (it stands for “name services switch”) tells the system what service to use for each type of name lookup.
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