This is an example of using the curl command to request a CakePHP URL and post form data to it. It uses xmllint to format the output and highlight (under MacOS) to colorize the output

#!/bin/sh
# save as curlIt.sh
curl -s \
-d "data[Label][start_date][day]=25&data[Label][start_date][month]=06&data[Label][start_date][year]=2018" \
-H "Accept: text/xml" http://servername/path/to/CakePHP/Form |\
xmllint --format - |\
highlight --syntax=xml --out-format=ansi