url-encode and url-decode using bash and xxd

urldecode

#!/usr/bin/env bash
# Ref: https://unix.stackexchange.com/questions/159253/decoding-url-encoding-percent-encoding
# Ref: https://github.com/sixarm/urldecode.sh

input="${@//+/ }"
echo -e "${input//%/\\x}"

urlencode

#!/usr/bin/env bash
while IFS= read -r -N1 char; do
  if [[ "${char}" =~ [-~[:alnum:]_.] ]]; then
    echo -n "${char}"
  else
    echo -n "%$(echo -n "${char}" | xxd -p)"
  fi
done < <(echo -n "${@}")