It turns out that sudo drops things into nsswitch.conf, too. It has
been suggested that we should mention this in the manual page.
Thanks,
Florian
diff --git a/man5/nsswitch.conf.5 b/man5/nsswitch.conf.5
index 1e0ec3c..7a5b744 100644
--- a/man5/nsswitch.conf.5
+++ b/man5/nsswitch.conf.5
@@ -28,7 +28,7 @@ nsswitch.conf \- Name Service Switch configuration file
.SH DESCRIPTION
The Name Service Switch (NSS) configuration file,
.IR /etc/nsswitch.conf ,
-is used by the GNU C Library to determine
+is used by the GNU C Library and certain other applications to determine
the sources from which to obtain name-service information in
a range of categories,
and in what order.
@@ -102,6 +102,14 @@ Shadow user passwords, used by
.BR getspnam (3)
and related functions.
.LP
+The GNU C Library ignores databases with unknown names. Some
+applications use this to implement special handling for their own
+databases. For example,
+.BR sudo (8)
+consults the
+.B sudoers
+database.
+.LP
Here is an example
.I /etc/nsswitch.conf
file:
