How to uninstall default apps on Mac with Terminal. Despite the warning, it is possible to remove unnecessary standard programs via Terminal. But first, you should know that with the release of macOS 10.12 Apple has made changes in its security technology System Integrity Protection (SIP) and it now forbids modifying system items on Macs. First, know that all Macs must have an admin account to be able to administer updates, install and uninstall apps, encrypt drives, and much more, but this does not mean you have to actively use an Admin account, and many Mac users rely on a “Standard” account for day-to-day activities on their computer.
Mac's don't need defragging as OS X automatically writes 2Gb or below sized files to one contiguous space on the drive. There are certain cases where's it's needed to free up a large spaces on the drive, but not something everyone has to do.
Far as other Mac maintainence, there really isn't any except to backup one's files regularly. Keeping Software Updated and run a web browser check to make sure the plug-ins are current.
For Safari and Flash, this check is more accurate
Most of those cleaning programs are junk, especially MacKeeper.
How to sign out of twitter app on mac.
If your friend got onto your computer and visited a bunch of adult sites, then I would recommend something like OnyX, doing ALL the cleaning and maintenance aspects and rebooting, perhaps followed by a Disk Utility Erase free space.
CCleaner beta is out for OS X, used on PC's and combines cleaning and scrubbing of the drive if setup correctly.
If your interested in performance, read my post here
How to change your default web browser
How to change your default email app
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You might be prompted to add an email account before you can change the setting in Mail. If you don't want to do that, check the preferences of the other email app. You might be able to set a default email app from there.
Apple Mac Standard Apps Windows 10Learn moreApple Mac Standard Apps Offline
Change the default web browser or email app on iPhone, iPad, or iPod touch.
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