Get UID/GID from a username string

[Ben RUBSON <ben.rubson@xxxxxxxxx>]

Hello,

I already do it with a RewriteMap Perl script, but perhaps a faster (in terms of performance) solution exists.
Let's assume an incoming request contains a username, is there a way to get the system UID of this username string (Linux/FreeBSD) ?
And from a UID string, to get the corresponding GID ?

Thank you very much,

Ben


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