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Category: macOS

Apple Mac operating system

macOS previously Mac OS X
macOS is based on UNIX
Since 10.5 (Leopard) based on Intel platform

Mac Show Hidden Files

In Finder to display of Hidden files by type Cmd + Shift + . (dot)

To turn on globally type the following command in Terminal:

defaults write com.apple.finder AppleShowAllFiles -bool true

To revert back to hidden append false:

defaults write com.apple.finder AppleShowAllFiles -bool false

To make the Finder change effective type:

killall Finder

HP 7520 WiFi scanning not working Mac OS High Sierra

If when installing an HP 7520 WiFi printer with HP Easy Start you get a warning that the scanner does not support “Bonjour” then you may end up with a working printer but no scanner!

In most cases this happens because you have a dual band router advertising 2.4GHz and 5GHz on the same SSIDs. In short the HP 7420 only works with the 2.4GHz network.

One solution is to disable the 5GHz network or rename it and only connect the Mac and printer to  the 2.4GHz SSID network.

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MAC Cleanup

Check hard disk Integrity to rule out disk faults

Boot the computer up in single user terminal. On chime press Command + S and run file system checker and repair

/sbin/fsck -fy

Reboot as follows:

/sbin/mount -uw /

Repair Permissions

Open Disk Utility and choose your main hard drive from the sidebar (in most Macs there will only be one.) Now click on First Aid and Repair Permissions.

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Change Yosemite Mail Default Message Font Colour

This is a work around for setting the Message default font colour.

Create a signature with Mail -> Preferences -> Signature selecting the mail account and + button like the one below in blue or desired colour:



Joe Bloggs

Now when you send a new message this signature will appear. If you insert your message between Hello and Regards it will be blue.