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getent allows to get the contents of several databases in their native file format even if they are not actually in /etc. For example, if you are using a LDAP or a DB to authenticate your users, you won't find their info by catting /etc/passwd, but "getent passwd" will concatenate /etc/passwd to the LDAP/DB.
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I just stumbled upon this today and it solves a MASSIVE problem for me. Thanks! LDAP group members have been a real pain to identify.