Strip a symbol from a fat library

strip.sh

#!/bin/bash
#
# Usage ./strip.sh libGoogleAdMobAds.a GAD_GTMStringEncoding.o

LIBRARY=$1
SYMBOL=$2
mkdir -p ./archs/

LIPO_OUTPUT=($(lipo -info $1))
ARCHS=()
ASSEMBLE_COMMAND="lipo"

I=1
TOTAL=${#LIPO_OUTPUT[@]}
for aString in ${LIPO_OUTPUT[@]}
do
    ITEM=${LIPO_OUTPUT[$TOTAL-$I]}

    if [[ $ITEM =~ .*: ]] ; then
        break
    fi

    ARCH=$ITEM
    ARCHS+=($ARCH)
    I=$[$I+1]

    # Thin out each arch from the library
    lipo $LIBRARY -thin $ARCH -output ./archs/$ARCH.a

    # Fix the permissions
    chmod 755 ./archs/$ARCH.a

    # Remove the offending symbol from each arch
    ar -d ./archs/$ARCH.a $SYMBOL
done

for ARCH in ${ARCHS[@]}
do
    ASSEMBLE_COMMAND+=" ./archs/$ARCH.a"
done

ASSEMBLE_COMMAND+=" -create -output $LIBRARY.stripped"

eval $ASSEMBLE_COMMAND