The Pane Emergency Tool

Introduction to the Emergency Tool

Under critical circumstances, your installation of macOS could be damaged by a disk drive failure or by a third-party application which used administrative permissions in such a way that the operating system is no longer starting correctly or does not start at all. When you cannot work with the operating system any longer, utility programs like TinkerTool System also can no longer be of any help to resolve this problem.

Similarly, macOS might still be running, but an important system component which is needed by TinkerTool System could be damaged. Even if TinkerTool System is capable of repairing this failing component during normal operation, this will not help in this particular case, because you might not be able to launch TinkerTool System due to the damage.

However, TinkerTool System offers a solution which can help you even in those two critical cases. The application contains a mini version which can be launched in the special recovery operating system of macOS. The recovery operating system is installed as an addition to each standard operating system into an “indestructible” disk image. It should always launch, even in emergency situations. The small standalone version of TinkerTool System is called TinkerTool System for Recovery Mode, or abbreviated ttsfrm.

Note that you should inform yourself beforehand, before a critical problem occurs, how to launch TinkerTool System in Recovery Mode. You will then be prepared for an emergency. The respective instructions can be printed.

Printing the Instructions

To print the instructions how to launch TinkerTool System for Recovery Mode, perform the following steps:

  1. Open the pane Emergency Tool of the section System Maintenance.
  2. Click the button Print these instructions….

TinkerTool System will automatically adjust the output to the paper size of your printer.

Emergency Tool
Emergency Tool

Instructions to Launch the Emergency Tool

In case you have printed this reference manual of TinkerTool System, the short instructions to launch the emergency tool are included here as well. Please note however, that the specific start command to launch the program can be different on each Mac, depending on where you copied TinkerTool System.

  1. Turn on your Mac and immediately press and hold the keys ⌘ + R until the Apple logo appears.
  2. If your Mac is protected by FileVault or by a security processor, you will see a password request after a while. Enter the requested password and continue. (This step is automatically skipped for unprotected Macs.)
  3. The window macOS Utilities opens. Use it to start Disk Utility and ensure your operating system volume is mounted. If not, mount it, which can require to enter a passphrase for decryption. If you are using macOS 10.15 Catalina or later, there will be two different visible volumes for the operating system, by default called Macintosh HD and Macintosh HD - Data. For such a modern setup, make sure both volumes are mounted.
  4. Quit Disk Utility and start Terminal via the menu Utilities.
  5. Enter the following command, including the quotation marks and with correct capitalization, pressing at the end.
Structure of the Launch Command

As mentioned already, the command can be different depending on the location of the program and the names of your volumes, folder, and application. It could be, for example:

"/Volumes/Macintosh HD/Applications/"

The actual call that must be typed into the Terminal window to launch the application, can be reconstructed as follows:

  1. The command always begins with "/Volumes/.
  2. The name of the volume where TinkerTool System is stored follows, together with a slash at the end.
  3. The path through the hierarchy of folders where TinkerTool System is stored on this volume follows, each part divided by slashes. If you are not working with macOS in English, please make sure to use the real folder names, not any presentation names established by the Finder. For example, if you copied TinkerTool System to your Desktop with the Finder running in French, the folder name will presented as Bureau. The actual folder name is Desktop, however.
  4. The name of the application follows, in this case TinkerTool System, followed by the ending .app and a slash.
  5. The command always ends with Contents/SharedSupport/".
  6. After the end of the command, the return key must be pressed.

This means the pattern of the call is


where all parts within angular brackets must be replaced by the actual names that are established on your computer. Don’t omit the quotation marks and don’t replace them by typographical variants.

Correlation between file position and repair options

If you have multiple disk volumes on your Mac or even multiple operating systems are installed, there will be restrictions which volumes will later be accessible in Recovery Mode and which operating system can be repaired. The following basic rule applies:

TinkerTool System for Recovery Mode only works on the volume and operating system where the application itself has been stored.

This results in the following consequences:

Using the Emergency Tool

TinkerTool System for Recovery Mode can only be used after the recovery operating system of macOS has been started. Detailed information on this topic can be found in the chapter Working in macOS Recovery Mode.

Old Versions of the Emergency Tool

Older variants of TinkerTool System had been shipped with a different type of emergency tool which was designed for the Single User Mode of macOS. This program had to be installed expressly in a separate step. Apple no longer supports Single User Mode of macOS officially and many Macs are now pre-configured by default to prohibit Single User Mode for security reasons. This has made the old version obsolete, so it should be removed. TinkerTool System detects automatically whether an outdated version of the previous software is available in the running operating system. It will shows this at the bottom of the Emergency Tool pane. In this case, simply click the button Remove legacy tool and follow the application’s instructions to clean your Mac.