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# Using libtool, lipo, ar and otool

lipo -info input.a

lipo -extract_family arm64 -output output.a input.a

# output.a is a fat file (use libtool(1) or lipo(1) and ar(1) on it)
# lipo output.a -thin arm64 -output output_arm64.a

ar -x output_arm64.a

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defaults write com.apple.dt.Xcode IDEBuildOperationMaxNumberOfConcurrentCompileTasks 0

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defaults write com.apple.finder AppleShowAllFiles -bool true

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- (NSString *)unicodeString:(NSString *)string {
    NSMutableString *retString = [NSMutableString stringWithCapacity:0];
    for (int index = 0; index < [string length]; index++) {
        [retString appendFormat:@"\\u%04x",[string characterAtIndex:index]];
    }
    return retString;
}