added usage comments

2 years ago · 9e3b379ec7
1 changed files with 6 additions and 0 deletions
--- a/6
+++ b/6
@ -1,4 +1,10 @@
 #!/usr/bin/awk -f
+# Process zone file for listing all ipv6 revDNS split into 3 columnes:
+# <file:hostname> <host_part> <block/64 part>
+#
+# Usage: ip6arpa zonefile* | column -t
+# or: ip6arpa <(echo check AAAA 2001:41d0:8:732b::3624:8eb6)
+#
 $1 ~/^[;#]/ || $0 !~ / AAAA / || $NF !~ /:/{next;}
 {
 NX=split( $NF, X, ":" );