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#!/bin/bash
FILE_LIST_CMD="find . -type f -name \"*.png\""
if [ -n "$1" ] ; then
FILE_LIST_CMD="echo $1"
fi
bash -c "$FILE_LIST_CMD" | while read PNG_FILE ; do
echo Compressing $PNG_FILE
hash optipng 2>/dev/null && optipng -o3 -quiet "$PNG_FILE"
hash advpng 2>/dev/null && advpng -z -4 "$PNG_FILE"
hash advdef 2>/dev/null && advdef -z -4 "$PNG_FILE"
hash pngcrush 2>/dev/null && pngcrush -q -ow -brute "$PNG_FILE"
done
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