add docs for ifdown/ifup/interfaces too

doc/ifup.scd

@@ -0,0 +1,56 @@
+ifup(8)
+
+# NAME
+
+ifup - bring interfaces up
+
+# SYNOPSIS
+
+ifup [<_options_>...] <_interfaces_>
+
+# DESCRIPTION
+
+*ifup* is used to configure interfaces according to how they are
+configured in the configuration database.
+
+# OPTIONS
+
+*-a, --auto*
+	Only match interfaces that are marked as _auto_.
+
+*-h, --help*
+	Display supported options to ifquery.
+
+*-i, --interfaces* _FILE_
+	Use _FILE_ as the config database.
+
+*-n, --no-act*
+	Show what commands would be run instead of actually running
+	them.  Useful for testing configuration changes.
+
+*-v, --verbose*
+	Show what commands are being run as they are executed.
+
+*-I, --include* _PATTERN_
+	Include _PATTERN_ when matching against the config or state
+	database.
+
+*-S, --state-file* _FILE_
+	Use _FILE_ as the state database.
+
+*-V, --version*
+	Print the ifupdown-ng version and exit.
+
+*-X, --exclude* _PATTERN_
+	Exclude _PATTERN_ when matching against the config or state
+	database.
+
+# SEE ALSO
+
+*ifdown*(8)++
+*ifquery*(8)++
+*interfaces*(5)
+
+# AUTHORS
+
+Ariadne Conill <ariadne@dereferenced.org>