Can Xdebug be triggered by Drush commands? I'm running into an issue with my Features modules and installation profile when installing the site with drush si. There are a number of probably related issues in the Features issue queue, but none with good solutions. The interesting part (mentioned in some of the issues) is that it works fine when installing the site through the browser, but fails when installing with drush si.

I have an idea of what's wrong, but need to confirm it. The only way I can think of confirming it is to step through the code with a debugger (Xdebug is what I have set up). So, is it possible to trigger Xdebug from a command run with Drush? Specifically, can I get Xdebug to kick in when I run drush si?
you have to remember that with drush you are (most supposedly) in cli, so this should help :

https://stackoverflow.com/questions/1947395/how-can-i-debug-a-php-cli-script-with-xdebug

also, try running the command with the option -d (--debug) - it should give you quite a lot of info about what is going wrong.