Extract extract-unzipsfx binary from 7z sfx archive (using 7z archive it was built from)

extract-unzipsfx

#!/bin/bash

if [ "$#" -lt 2 ]; then
    echo ""
    echo "Usage: extract-unzipsfx <SFX_EXE_PATH> <7Z_ARCHIVE_PATH>"
    echo ""
    exit 1
fi

head -c $(expr `wc -c < $1` - `wc -c < $2`) $1