--- /dev/null
+ DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
+ Version 2, December 2004
+
+ Copyright (C) 2004 Sam Hocevar <sam@hocevar.net>
+
+ Everyone is permitted to copy and distribute verbatim or modified
+ copies of this license document, and changing it is allowed as long
+ as the name is changed.
+
+ DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
+ TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
+
+ 0. You just DO WHAT THE FUCK YOU WANT TO.
+
--- /dev/null
+
+Overview
+--------
+
+Hath is a Haskell program for working with network blocks in CIDR[1]
+notation. When dealing with blocks of network addresses, there are a
+few things that you (i.e. I) want to do with them:
+
+ * Create a regular expression matching the CIDR block(s). This is
+ because grep will throw up if you feed it CIDR.
+
+ * Combine small blocks into larger ones. For example, if you have two
+ consecutive /24s, they might combine into a larger /23.
+
+ * View the result of block combination in a useful way.
+
+Hath does just that. It takes as its input (via stdin, or a file with
+the -i parameter) a list of CIDR blocks. From now on, assume we have
+the following in cidrs.txt:
+
+ 10.0.0.0/24
+ 10.0.1.0/24
+
+
+Modes
+-----
+
+Hath has the following modes:
+
+ * Regexed
+
+ This computes a (Perl-compatible) regular expression matching
+ the input CIDR blocks. It's the default mode of operation.
+
+ $ hath -i cidrs.txt
+ ([^\.0-9](10)\.(0)\.(0)\.(0)[^\.0-9]|[^\.0-9](10)\.(0)\.(1)
+ \.(0)[^\.0-9])
+
+ * Reduced
+
+ This combines small blocks into larger ones where possible, and
+ eliminates redundant blocks. The output should be equivalent to
+ the input, though.
+
+ $ hath reduced -i cidrs.txt
+ 10.0.0.0/23
+
+ * Duped
+
+ Shows only the blocks that would be removed by reduce; that is, it
+ shows the ones that would get combined into larger blocks or are
+ simply redundant.
+
+ $ hath duped -i cidrs.txt
+ 10.0.0.0/24
+ 10.0.1.0/24
+
+ * Diffed
+
+ Shows what would change if you used reduce. Uses diff-like
+ notation.
+
+ $ hath diffed -i cidrs.txt
+ -10.0.0.0/24
+ -10.0.1.0/24
+ +10.0.0.0/23
+
+Each of the modes also supports a present-tense flavor; the following
+are equivalent to their counterparts: regex, reduce, dupe, diff.
+
+
+Bugs
+----
+
+Send bugs to the moon[2].
+
+
+
+[1] http://en.wikipedia.org/wiki/Classless_Inter-Domain_Routing
+
+[2] michael@orlitzky.com