Updating boot caches os x
These can be used either if you are logged in in Single User mode (after holding Command-S at startup to drop you to a root terminal prompt instead of loading the OS X interface), or if you are logged in remotely through an SSH connection.
Two options for use in the Terminal are the "diskutil" command, and the "fsck" command.
If you're using Google Chrome as your browser, look at the top right corner, at the end of the search bar. Near the bottom of the list, there is an option that says "Empty cache." Select it.
If you are concerned about your Mac starting to run slow or become unstable, you may have looked into regularly running maintenance routines to clear caches, log files, and other temporary items from your system.
If for some reason the routine seems stuck (which is rare but may happen), since it is just a checking routine, you can force-quit Disk Utility to halt the check and return your system to a usable state.
There are also alternatives to the Disk Utility program built in to OS X.
If problems do exist, then you can fix them by booting the system to the OS X installation or recovery volume and then using Disk Utility there to repair them, or running the diskutil commands listed above again but using "repair Volume" instead of the "verify Volume" command.
The final option is to use the "fsck" routine, which is similar to the diskutil command and runs the same checking routines, but is a little barer.For the second command, VOLUME is some name that will target the boot partition itself, instead of the drive. The first is to use the name of the boot volume, which should be surrounded by quotes if there are spaces in it (or you can properly escape the space characters with a backslash before them).The second is to use the slice ID for the volume, which looks like the device ID, but with an "s1" or "s2" appended. Gonzalo Martinez is the President of Clever Tech, a tech repair business he founded over 5 years ago.Clever Tech LLC specializes in repairing Apple branded devices like i Phones, i Pads, Macbooks & i Macs.