Mac
Week numbers in Mac OS X
How to make Mac OS X display the current week number.
Merging directories (folders) on Mac OS X
Copying a folder on top of another folder with the same name in the Mac OS X Finder will replace the entire contents of the target folder. This is not always what you want, so luckily there are other ways of copying folders.
A selection of Mac OS X keyboard shortcuts
A selection of the Mac OS X keyboard commands I find myself using a lot, some of which may not be all that well-known.
Merging directories (folders) on Mac OS X
Copying a folder on top of another folder with the same name in the Mac OS X Finder will replace the entire contents of the target folder. This is not always what you want, so luckily there are other ways of copying folders.
Open hidden folders in the Mac OS X Finder
To open hidden folders in the Mac OS X Finder, either press Shift + Cmd + G and enter the folder’s path or type "open /path/to/folder" in a Terminal window.
Reformat and repartition hard drives before using them with Time Machine
Most hard drives you buy are not fully supported by Apple’s Time Machine until you repartition them, but Time Machine does not warn you about it.