How to reinstall macOS from macOS Recovery

Learn how to use macOS Recovery to reinstall the Mac operating system on your built-in drive or an external drive.

macOS Recovery makes it easy to reinstall the Mac operating system, even if you need to erase your startup disk first. All you need is a connection to the Internet. If a wireless network is available, you can choose it from the Wi-Fi menu in the menu bar. This menu is also available in macOS Recovery.

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How to create a bootable installer for macOS

You can use an external drive or secondary volume as a startup disk from which to install the Mac operating system.

These advanced steps are primarily for system administrators and others who are familiar with the command line. You don’t need a bootable installer to install macOS, but it can be useful when you want to install macOS on multiple computers without downloading the installer each time.

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How to speed up Time Machine so it backs up your data faster – macOS

If you are a constant-on Time Machine user, you won’t even notice when a scheduled backup is taking place. That’s because Time Machine is designed to work quietly and slowly in the background. Most of your regular backups are incremental and therefore don’t need much power. If you only back up your Mac once per week (or longer), Time Machine has a lot more work to do, but still runs quietly and slowly in the background. Using this Terminal command, you will disable the disk operation throttling so Time Machine will run faster.

sudo sysctl debug.lowpri\_throttle_enabled=0

Restore default setup:

sudo sysctl debug.lowpri\_throttle_enabled=1

Keychain Password Reset – macOS

Your keychain password lets you automatically authenticate applications and services stored in Keychain Access. When the account is created the keychain password is set to match the login password for the account.

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Youtube-dl – tips

Youtube-dl is a python based command line video downloader that just works. Despite its name would suggest, youtube-dl downloads more than just youtube videos, it currently supports more than 800 online video and audio sites. If you are using a desktop app or web app to download videos now, chances are it’s using youtube-dl in the back-end. You are better off using youtube-dl instead considering you get so much more power and options with it. Here are some simple tips to get you started.

Install from the source

There are multiple options to get started with installing youtube-dl, I personally recommend installing from the source simply because how frequently its database gets updated and most OS package managers are a bit late when keeping up with the updates. The best thing about youtube-dl is that it runs on all major OS as long as you have python installed.

Windows users can download latest exe file. For Linux, MacOS users:

sudo curl -L https://yt-dl.org/latest/youtube-dl -o /usr/local/bin/youtube-dl
sudo chmod a+rx /usr/local/bin/youtube-dl

Download using cURL to the proper application directory.
Apply proper access permission to run youtube-dl.
Always update to the latest version

Online video players are updated frequently which can often break how youtube-dl download video files from your favorite site. So, just like browser video downloading extensions, it’s a good idea to keep it up-to-date. You could make a cronjob, but I prefer to do it manually.

Updating youtube-dl is as simple as typing:

youtube-dl -U

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Upgrade to macOS High Sierra

Upgrading from previous versions of OS X

Upgrading from OS X Snow Leopard or Lion
If you’re running Snow Leopard (10.6.8) or Lion (10.7) and your Mac supports macOS High Sierra, you will need to upgrade to El Capitan first. Click here for instructions: https://support.apple.com/en-us/HT206886


Upgrading from OS X Leopard

If you’re running Leopard and would like to upgrade to macOS High Sierra, first you’ll need to upgrade to OS X Snow Leopard. You can purchase OS X Snow Leopard from the Apple Online Store.