Data Detectors allow you to turn addresses, phone numbers and dates in mail messages into Address Book contacts and iCal events. You can also turn selected text into to-do items or stickies.
If you prefer to type instead of using the mouse and cursor you can manage your files and folders with the Terminal. You can use commands to list, open, rename, move and delete files. You can do nearly everything that you can do in the Finder, and some commands are even more powerful.
You can share the screen of another Mac pretty easily. But it seems like it is impossible to do the same with another account on the same Mac. However, if you use Terminal to set up an ssh tunnel, you can share the screen of a second account using an alternate port number. This allows you to stay logged in to one account, while you use another account in a screen sharing window.
Most Mac Terminal commands posted online are actually simple commands that just change a preference for an app or part of macOS. When you use a command like "defaults write" all it is doing is editing a small preference file in your user Library folder. Take a look at what actually is changed.
An alternative to using Spotlight or the Finder to search for files is to use the Find command in the Terminal. You can search for files by name and refund the search by location, time and other factors. While not useful for everyday file searches, this could be used to search through large libraries of files for particular results.
You can peer into a zip archive and see which files are in there using the zipinfo Terminal command. You can refine the results to show you only the files with fgrep. You can take this same command and use it as a Shell Script in an Automator service for easy access. In this tutorial you'll also learn about using Shell Scripts with files as input arguments in Automator.
Shell scripts can be created in TextEdit and run in the Terminal app. In this example, we'll create a script that takes a single image and produces multiple versions of that image by looping through a series of sizes. This script can be used again and again to reproduce the image series when changes are made to the original.
If you want to prevent yourself from going to a website you can manually block a domain using the Terminal. To do so, you must edit your hosts file and redirect a domain to your local address. This could be useful to help you resist distractions while getting work done.
You can use the Terminal to restart either the Dock, Finder or your entire Mac. This comes in handy for developers, those testing software, or those using unstable software when problems arise and you need to restart one of these services but other methods are not working.
By default your Mac screenshots will appear on the Desktop. However, if you take screenshots often, it could be useful to set up a dedicated folder for them and have them automatically save there. You can do this with a simple Terminal command.
Ruby is a popular programming language that comes installed on your Mac and can be accessed in the Terminal. You can use the Rub command line interpreter to run simple programs in a single line. You can also write more complex programs in a text file and run them. This gives you similar functionality to using BASIC on the Apple II.
For most apps you can simply open multiple windows or tabs to edit or view separate documents. But some apps only let you have one window open. Sometimes when using apps like Safari, it is useful to be able to isolate windows from each other in case one crashes. Learn how to use the Terminal window to launch multiple instances of the same app. Learn how to then use Automator to create an app that will do this for you automatically.
There are some odd and unusual things on your Mac that you can do with the Terminal. You can create banners, use your screen saver as your desktop background, look at interesting, daily calendars, and play hidden games.
If you are an advanced user with trouble, or someone who like to tinker with Mac OS X settings, then take a look at OnyX. This free utility gives you easy access to Terminal commands and hidden preferences.
You can launch an application using the Finder, Dock, keyboard, Terminal and even your voice. See how many of these you knew about.
You can customize the top of every Mac OS X Finder window adding useful buttons that perform common tasks. You can also add files, folders and applications to the toolbar.
There are four text editors you can use from the Terminal: Pico, Nano, Vi and Emacs. Each can be used to quickly edit text files. Learn how to access them and what makes them different.
Sometimes the Finder can fail you when you want to copy lots of files, like an entire CD or DVD. Learn how to use the Terminal to copy whole volumes with better error handling and reporting.
How to use the built-in Mac OS X spell check in many applications like TextEdit, Mail and Safari. You can make it learn new words and reset your custom dictionary.
Gary Rosenzweig takes a look at three methods of merging files inside of folders. You can use Apple's FileMerge that comes with XCode, the 'ditto' command in Terminal or a variety of downloadable programs including File Synchronization.