#!/bin/sh
#
# Print filenames of GIF files containing 2 color table entries
# (most likely black & white)
#
find . -name '*.[Gg][Ii][Ff]' -exec sh -c 'gifsicle -I "{}" 2>/dev/null | \
	nawk "/table \[2\]/ { print \"{}\" }"' ';'
.