CMD specifies what command to run within the container. RUN builds your application with make. Re-download Mountain Lion InstallerCOPY adds files from your Docker client’s current directory. But just in case of bad luck, we need to do some work on BACKUP , this is crucial for macOS reinstallation without losing data.While I was doing maintenance for my OS X, using the Maintenance app, the app told me that. In fact, reinstallation of macOS doesn’t necessarily cause lost data, it just create a new copy, your existing files and data saved in programs won't be altered or deleted.
What I Need To Copy For A Clean Of New How To Install ANormally, you can start up a Mac while holding down Command-R to boot into what Apple now calls macOS Recovery. We're going to take a look at how to install a fresh copy of El Capitan on one of those supported Macs via a bootable USB. As you know by now, the final build is now available to download free-of-charge from the Mac App Store for an impressive range of compatible Mac hardware. All Looking to do a clean install of OS X El Capitan 10.11 on your Mac Here's a step-by-step guide on how to do that.In the Recovery app window, select Reinstall macOS Big Sur, click Continue, then follow the onscreen instructions.Here’s how you can download and obtain a soft copy of Mountain Lion.Select ‘Reinstall macOS,’ at which point Internet Recovery will download and install a fresh copy of macOS. When the erase process is complete, click Done, then choose Disk Utility > Quit Disk Utility. The installer you downloaded from the App Store automatically deletes itself after you’ve successfully upgraded (or install) your Mac.Type a name for the volume in the Name field, click the Format pop-up menu and choose APFS, then click Erase Volume Group. First, grab hold of a copy of the Mountain Lion installer file.![]() ![]() Now, we are going to create a bootable OS X Mountain Lion in the USB drive. Once the USB drive is formatted, re-select the formatted USB drive from the left menu, and click the Restore tab. Keep a backup of the files within if you still need them, then come back to this section. Under Erase tab, select Mac OS Extended (Journaled) format and click the Erase button.Note: This will remove everything in the USB drive. Select the USB drive on the left menu, Erase tab. Plug your USB drive into your Mac and launch the Disk Utility application When you see the screen in the screenshot below, select Mac OS X on the right. Restart your Mac, hold down the Option key when you see the Apple logo. Reboot, Clean up and reinstallSo we’ve downloaded a new copy of Mountain Lion, copied it over to the USB drive and made it bootable.Now, we will attempt to remove everything from the current OS and reinstall a new copy of OS X Mountain Lion. Adobe photoshop for mac 1095 freeSelect Reinstall OS X, the second option from the list.Your Mac will now reinstall from the USB drive and when it is done you will be presented with new copy of OS X Mountain Lion. When you are done, you will be directed back to the OS X Utilities dialogue. Click the Erase button button and everything (including files, applications, settings, etc) in your Mac will be completely deleted.Note: Do this with caution and make sure you have already backup all important files and data as there will be no way for recovery from this point onwards. At the Disk Utility screen, select your Mac’s hard drive, then click Erase tab and select Mac OS Extended (Journaled) as format.
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