extend-hosts-list

#!/usr/bin/env bash
#
# expand-intranet-hosts v1.0
#
# expand the hostnames from `dns-hostnames/common-intranet-hosts.txt` by
# appending various combinations of numbers and letters to them..
#
# Written by:    Derek Callaway [decal (AT) sdf (D0T) org]
# Last Modified: Mon Oct 23 18:53:38 PDT 2017
# Tested On:     Ubuntu Bash on Windows Subsystem for Linux
#                Darwin 17.5.0 Darwin Kernel Version 17.5.0: Mon Mar  5 22:24:32 PST 2018; root:xnu-4570.51.1~1/RELEASE_X86_64 x86_64 i386
# Use Case:      scripts/expand-host-names dns-hostnames/common-intranet-hosts.txt > dns-hostnames/expanded-intranet-hosts.txt
#

if [ ! "$1" ]
  then echo 
  echo "usage: $0 FILE [...]"
  echo '  FILE  one or more files containing strings to append to number/letter combinations to'
  echo

  exit 1
fi

for h in $*
  do echo $h
  echo -e "${h}0\n${h}1\n${h}2\n${h}00\n${h}01\n${h}02\n${h}-0\n${h}-1\n${h}-00\n${h}-01\n${h}-02\n${h}a\n${h}b\n${h}c\n${h}-a\n${h}-b\n${h}-c"
done 

exit 0