Convert hex data to binary with a bash function (requires bash v4+ for the @^^ lowercase hex demangling)

hex2bin () { s=${@^^}; for i in $(seq 0 1 $((${#s}-1))); do printf "%04s" `printf "ibase=16; obase=2; ${s:$i:1};\n" | bc` ; done; printf "\n"; }
Use this function with bash version 4+ to convert arbitrary hexadecimal sequences to binary. If you don't have bash 4+ then modify the lowercase to uppercase demangling statement s=${@^^} to set s equal to the uppercase hex input or the bc command throws an input parser error.
Sample Output
$ bash --version
GNU bash, version 4.4.23(1)-release (x86_64-apple-darwin17.5.0)
$ hex2bin 000000000019d6689c085ae165831e934ff763ae46a2a6c172b3f1b60a8ce26f
0000000000000000000000000000000000000000000110011101011001101000100111000000100001011010111000010110010110000011000111101001001101001111111101110110001110101110010001101010001010100110110000010111001010110011111100011011011000001010100011001110001001101111

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