Ordinarily Terminal doesn’t obey the usual Option (Alt)+Delete keystroke that deletes a word behind the cursor in other apps. To make Terminal do so, hit Escape, then hit Delete. You will need to do this for each word you want to delete - Escape, then Delete; Escape, then Delete; etc.

If you’re editing a file in nano, emacs or vim, you can hold down Option (Alt) then click anywhere in the file to move the cursor there. It works at the command line too - you can jump to anywhere in the line you’re currently typing by holding down Option (Alt) and clicking there.

This means you can have the Flash player installed on your Mac, but blocked for your wider web experience, while still being allowed on a few select sites that you trust the plugin to run on. This serves as a perfectly reasonable alternative to uninstalling the plugin in it's entirety, and it's easy to configure for all websites and selective websites in Safari for OS X.

• Open Safari and then go to "Preferences", accessible from the Safari menu.
• Choose the "Security" tab and look for "Internet plug-ins", then click the "Manage Website Settings…" button.
• Select "Adobe Flash Player" from the left side to gather a list of websites that have used or attempted to use the Flash plug-in.
• Pull down the menu alongside each URL to fine-tune Flash for that website, choosing one of five options:

Ask – Safari will ask permission to run Flash if it is encountered.

Block – blocks all Flash for the website from automatically loading, this is essentially like Click-To-Play and can be overruled by selecting a Flash object and choosing to run.

Allow – Flash will always run when encountered for that specific website.

Allow Always – Flash will always run when encountered for specific websites, even if the Flash plugin has been disabled due to being outdated or insecure.

Run in Unsafe Mode – not recommended, overrides any security preferences within Safari to give Flash free reign to run.