Remove the _CodeSignature folder from an existing .ipa iOS App archive

unsign

#!/bin/sh
#set -x
if [ "$*" == "" ] ; then
    echo "USAGE: unsign App.ipa [App2.ipa] [App3.ipa] [...]"
    exit 1
fi

for var in "$@"
do
	if [ ! -f ${var} ]
	then
		exit -1
	fi

	DIR=`dirname ${var}`
	BASE=`basename ${var} .ipa`

	if [ -d ${DIR} ]
	then
		DIR="${DIR}/"
	fi

	TMP=${DIR}_unsign_tmp/

	if [ -d ${TMP} ]
	then
		rm -rf ${TMP} || exit -2
	fi

	mkdir ${TMP} || exit -3

	cp ${var} ${DIR}${BASE}.zip
	unzip -o -q -d ${TMP} ${DIR}${BASE}.zip 
	rm ${DIR}${BASE}.zip

	rm -rf ${TMP}Payload/*.app/_CodeSignature

	cd ${TMP}

	zip -q -r ../${BASE}.ipa *

	cd - 1>/dev/null

	rm -rf ${TMP}

done
#set +x