unique-file-extensions

#!/usr/bin/env bash
#
# unique-file-extensions v1.1
#
# Show unique file name extensions found in the repository's directory hierarchy
# (this requires filtering out the staging and scripts directories and duplicates)
#
# Written By:   Derek Callaway [decal (AT) sdf {D0T} org]
# Last Updated: Sat Apr 21 10:36:19 PDT 2018
# Tested On:    Kali GNU/Linux Rolling
#               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
#

if [ ! -d scripts ]
  then echo
  echo "usage: $0"
  echo 
  echo 'Must be run from repository root!'
  echo 'ex. scripts/uniq-file-exts'
  echo

  exit 1
fi

find . -maxdepth 1 -type d -name '*-*' -exec \
  find {} \; -type f -name '*.*' -and -not -iname '*.lst' -exec \
    basename {} \;  | egrep -v '(staging|scripts)/' | awk '{ FS="." } {print($3);}'  | sort -u | \
      tr '[A-Z]' '[a-z]' | egrep -v '^$'

exit 0