dl_tool=$(command -v curl || command -v wget) if [[ ${dl_tool} == *curl* ]]; the...

    dl_tool=$(command -v curl || command -v wget)
    if [[ ${dl_tool} == *curl* ]]; then
      dl_cmd="${dl_tool} -sLO $1"
    elif [[ ${dl_tool} == *wget* ]]; then
      dl_cmd="${dl_tool} -q $1"
    else
      printf "%s\n" "ERROR: curl and wget not available, exiting"
    fi

Can easily be turned into a function.