Prior to OS X Mavericks 10.9 a user’s Desktop image was stored in com.apple.desktop.plist located in the ~/Library/Preferences/ folder and changed from the command line using:
defaults write com.apple.desktop Background '{default = {ImageFilePath = "/path/to/desktop/image.jpg";};}'
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In the Clock tab of the Date & Time pane of System Preferences you can choose between displaying a digital or analog clock in the menu bar. For a digital clock there are five options that determine how the date and time are displayed:
Your Mac’s network name forms part of its network address. If you want to share your Mac’s files and folders with other computers on your network you’ll need to know its network address so that those other computers can connect to it. This information is readily available in System Preferences, but this article looks at how to get your Mac’s network name using the command line.
(more…)Type the query add recents dock terminal into any Internet search engine and most – if not all – relevant entries on the first results page will give the following code or a slight variation of it:
defaults write com.apple.dock persistent-others -array-add '{"tile-data" = {"list-type" = 1;}; "tile-type" = "recents-tile";}'; killall Dock
Most of these articles are from 2015 or earlier and the Mac OS has changed a lot since, but the code still appears to do exactly as advertised.
(more…)A web site located on a local computer is accessed in a browser through the URL localhost and normally served by a local Apache server. There are two parts to this process. The first is the resolution of the name localhost to the IPv4 loopback address 127.0.0.1 which is configured in the local computer’s hosts file.
(more…)I’m probably doing Cloudflare a disservice by categorising it as a CDN provider, but that’s certainly one of the many services they offer and perhaps how most individuals using their free offering see them. Like me, I’m certain the vast majority of that group use the Cloudflare dashboard to configure their domains, but Cloudflare provides an API that allows you to programmatically manage those DNS records through a command-line interface of a Unix shell such as Bash.
(more…)I had a situation where I needed to pass code to Python in the form of a single command instead of a script file. While this is easily done by invoking Python in command mode, the code contained a conditional statement that caused Python to throw an error.
(more…)Before selling my late 2015 27″ iMac Retina 5K I wanted to secure erase its 1TB Fusion Drive consisting of a 24GB SSD and 1TB HDD. Secure erasing an HDD is simple enough using the Security Options in Disk Utility, but for Fusion Drives and SSDs this option is not available. To secure erase the iMac’s HDD I first needed to break the Fusion Drive into its constituent parts using Terminal.
I’ve just started learning how to subnet and while there are plenty of resources to help with the calculations and understand the maths I tend to grasp things better if I have some visual representation.
To help, I put together the following table which – I hope – nicely illustrates the patterns of binary 0s and 1s in the 4th octet of a class C IP address and their correlation to the patterns of block sizes, network IDs, host IDs and broadcast addresses of the various subnets. The table is not intended to explain how to calculate subnets nor even to act as a cheat-sheet, but others may find the visual representation helpful.
(more…)The desktop version of Cisco Packet Tracer (CPT) is currently available in three flavours: 32-bit and 64-bit versions for Windows 7, 8.1 and 10 and a 64-bit version for Linux. There is no macOS version so I decided to install the 64-bit Linux version of CPT (7.1.0.0222)1 on Ubuntu 16.04.3 LTS running on VMware Fusion (10.1.1).
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