Verify and Repair Disk Permissions via Terminal (Mac OS X) Verify Permissions diskutil verifyPermissions / Repair Permissions diskutil repairPermissions / Verify and Repair Volume via Terminal (Mac OS X) Launch Terminal from your Dock, Utilities folder, or via an app launcher like Alfred. Once launched, type or paste in the following command. Diskutil verifyVolume [drive name] So, for your main hard drive, you could type or paste in something like: diskutil verifyVolume / Or, if you have an external drive attached, you can type or paste in the following: diskutil verifyvolume /Volumes/[drive name]/ So for an external drive named “BackupStuff” you would enter: diskutil verifyvolume /Volumes/BackupStuff/ If you see no messages, then you can assume that diskutil hasn’t found any errors, and you can move on. If, however, you get an error like “The volume Macintosh HD was found corrupt and needs to be repaired,” then you can repair the drive using diskutil as well. To repair the drive, you can issue the following command into Terminal: diskutil repairvolume / Or, for that external drive as above: diskutil repairvolume /Volumes/BackupStuff/. If unable to unmount drive on Mac You can try booting from OS X recovery by holding CMD + R at the time of startup.

Boot to internet recovery or a USB drive with the High Sierra Installer (standard Sierra recovery mode won't do). Do diskutil umount force /Volumes/Macintosh HD/. (replace disk1 with your disk id if needed). Mac has missing disk space after upgrading to mac OS High Sierra. A macOS High Sierra problem some people have reported encountering is that after the upgrade they have noticed their hard drives.

Once booted from OS X recovery, select Terminal from the utilities and then at the unix prompt enter: • diskutil list • then press return and look for the disk identifier and enter the following command with the disk identifier: • sudo diskutil unmountDisk /dev/(enter here disk identifier name) • Press return and enter your admin password if prompted. This should unmount all volumes of the physical drive. • If still the above method didn't work, then the last option is to force the entire disk to unmount.

• For that using the terminal application again, enter the following command: sudo diskutil unmount force /dev/(enter here disk identifier name) • Then press return and enter the admin password if prompted. This will definetely unmount the entire disk and all its related volume. Google chrome for mac image. Mac OS X Software Update via Terminal To get a list of available software updates, type the following command: softwareupdate -l You will see a list of available updates. You can then install all available software updates with the following command: sudo softwareupdate -iva The use of sudo is required to get superuser privileges to actually install the updates. Control Time Machine from the command line Time Machine is a great tool for ensuring that your data is safe, and it's pretty. But for some users, the basic Time Machine interface isn't enough.

As with most of OS X's functions, there is a command-line tool that lets you do many things with Time Machine. Here's how you can use the tmutil command to control and tweak Time Machine from Apple's command-line tool, Terminal. The basics Most people won't need to use this command for their backups because the Time Machine interface will suffice.

Who will need it? People who want to manage remote Macs or who want to run scripts containing commands for Time Machine. The basics of the tmutil command can be found by typing man tmutil in Terminal.

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(You'll find the Terminal app in your /Applications/Utilities folder.) The man page tells you what you can do with this command. For example, to turn Time Machine on or off, you can run these commands: sudo tmutil enable sudo tmutil disable The sudo command is required for many of the commands you issue with tmutil because you need administrative privileges; you'll have to enter your password after running the above commands. If you want to run a Time Machine backup right away, on a Mac that either has Time Machine disabled, or, say, just before updating to a new version of OS X, you can run this command: tmutil startbackup This is the same as choosing Back Up Now from the Time Machine menu in the menu bar at the top of your screen. And if you ever want to stop a backup, just run this: tmutil stopbackup Save disk space on your laptop Since your laptop isn't always connected to its backup disk, Time Machine retains 'local snapshots,' or files that it will copy to your backup disk the next time it is available.