Pretty simple.

#!/usr/bin/env bash
 
wget -S $1 2>&1 | grep -q -m 1 "Expires: Sun, 19 Nov 1978 05:00:00 GMT" \
&& echo "Yes" || echo "No"

Save the script in a file called is-drupal, and make it executable (i.e. chmod +x is-drupal) and put it in a directory in your path (e.g. ~/local/bin/). Now, you can easily check a site with following command:

is-drupal www.federicopistono.org

Found here.

How to use your favourite editor with the best framework? Save the file as ~/.vimrc-drupal and create an alias in the ~/.bashrc to use this configuration uniquely with Drupal.

File ~/.bashrc || ~/.bash_profile

alias vid="vim -u ~/.vimrc-drupal"