There are any number of tools for resizing the browser window to check responsive designs. One that stands out for me is the Media Query Bookmarklet from the Sparkbox Foundry. This shows you the currently applied media queries and browser size in both pixels and ems.
Once you've used this you'll wonder how you managed without it.
Note: The main page says in works in Chrome and Safari. It also works in IE10.
Details at http://seesparkbox.com/foundry/media_query_bookmarklet
du -sh for the quick answer, ncdu for the cleanup, df for the disk itself: every command for checking directory size in Linux, plus why du and df never agree.
One :%s command replaces every match in a file before a find dialog would even open. The Vim substitute patterns worth the muscle memory: flags, ranges, capture groups, and multi-file edits.
Your existing team is buried in the complexity of your existing product. AI rewards the team with a blank slate. Most companies don't have one.
The stories about offshore "not working" are rarely about skill. They are about an invisible communication gap, and it starts the moment someone says yes.