macOS FAQ

How do I log out?

In the bar at the top of the screen, click the menu below the Apple logo, with "Log out" at the very bottom.

How do I launch the text terminal?

You can launch the text terminal as follows:

1. Open the Finder app (the first smiling face icon in the bottom bar).
2. I click on Applications.
3. I click on Applications and click on Utilities.
4. I click on Terminal. A jumping terminal icon may appear for a moment, indicating that the application is launching.

A new terminal window is created by clicking File → New Shell. The menu is at the top of the screen.

XCode error "The operation couldn't be competed. (Cocoa error - 102.)"

You may encounter this error when trying to run your app via Xcode in iOS Simulator. It is caused by the fact that iOS Simulator does not support running apps that are in a location connected over an NFS network. Yet the home directories where the apps are placed are currently connected via NFS.

The solution is to create a local directory where the apps are stored and redirect iOS Simulator to it. This can be accomplished by running the following commands in the terminal:

mkdir /tmp/$USER
mkdir -p ~/Library/Developer
rm -rf ~/Library/Developer/CoreSimulator
ln -s /tmp/$USER ~/Library/Developer/CoreSimulator

If you log on to another machine, you need to execute the mkdir step again, as it is a local directory on that machine. When you have finished working, it is advisable to delete this directory ( rm -rf /tmp/$USER).

Where to find help?

If you do not know what to do and cannot solve your problem on your own, you can write to unix@fi.muni.cz, where we will try to help you.