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str2hex_echo() {
    # USAGE: str2hex_echo "ABC"
    # returns "\x41\x42\x43"
    local str=${1:-""}
    local fmt="\\\x%x"
    local chr
    local -i i
    for i in `seq 0 $((${#str}-1))`; do
        chr=${str:i:1}
        printf "${fmt}" "'${chr}"
    done
}

str2hex_echo "Marcos"