kextunload MacOS Command Guide

The MacOS kextunload command is used to unload kernel extensions on a Mac system. Kernel extensions are pieces of code that enhance the operating system’s functionality and help it communicate with hardware devices. With kextunload, users can unload these extensions when they are no longer needed, freeing up system resources and potentially resolving conflicts. This command can be particularly useful when troubleshooting issues related to hardware devices and drivers. By unloading specific kernel extensions, users can isolate problematic components and streamline the system’s operation. It is important to note that using the kextunload command requires administrative privileges and should be done with caution to avoid disrupting system stability.

kextunload Syntax:

kextunload [-b bundle_id] [-v] [-V] [-c bundle_id] [-t] [-q] [-b bundle_id [-v[v] [-t] [-q]]] [-h] [bundle_id ...]

Options:

Option	Description
-b bundle_id	Specifies the bundle ID of the kext to be unloaded
-v	Verbose output, display progress
-V	Very verbose output, display even more information
-c bundle_id	Unload the bundle specified and its dependents if possible
-t	Test the kexts (unload will not occur)
-q	Quiet, print only errors and warnings
-h	Display usage help

Parameters:

Parameter	Description
bundle_id	One or more kext bundle IDs to be unloaded

Caution

Exercise caution when using the kextunload command as unloading kernel extensions can impact the stability and functionality of your system. Ensure you fully understand the consequences of unloading a specific kernel extension before proceeding.

kextunload Command Samples:

Unload a Kernel Extension by Bundle ID

sudo kextunload -b com.apple.driver.AppleHDAController

Unloads the kernel extension with the specified bundle ID “com.apple.driver.AppleHDAController”.

Unload a Kernel Extension by Kext Path

sudo kextunload /Library/Extensions/Example.kext

Unloads the kernel extension located at the specified path “/Library/Extensions/Example.kext”.

Unload Multiple Kernel Extensions

sudo kextunload -b com.test.kext1 -b com.test.kext2

Unloads multiple kernel extensions using their respective bundle IDs.

Unload a Kernel Extension and Verbose Output

sudo kextunload -v 3 -b com.test.kext

Unloads the kernel extension and provides verbose output at the specified verbosity level.

Unload a Kernel Extension with Force Option

sudo kextunload -f /System/Library/Extensions/Example.kext

Forces the unloading of the kernel extension located at the specified path.

Unload a Kernel Extension by Matching Identifier

sudo kextunload -b com.test.*.kext

Unloads kernel extensions matching the specified bundle identifier pattern.

Unload a Kernel Extension Quietly

sudo kextunload -q /Path/To/Example.kext

Unloads the kernel extension quietly without displaying any output.

Tip

When using the kextunload command in MacOS, make sure to have administrative privileges as this command requires root access. Additionally, always refer to the official documentation or man pages for more detailed information on specific options and usage.

kextunload FAQ:

How do I use kextunload in MacOS?

To use the kextunload command in MacOS, execute the following command:

kextunload --bundle-id com.example.kext

What is the purpose of kextunload in MacOS?

The kextunload command in MacOS is used to unload kernel extensions (kexts) from the running kernel.

Can I unload multiple kernel extensions at once with kextunload?

Yes, you can unload multiple kernel extensions at once by specifying multiple bundle identifiers in the kextunload command.

kextunload -b com.example.kext1 -b com.example.kext2

How can I force unload a kernel extension using kextunload?

To force unload a kernel extension with kextunload, use the ‘-f’ flag in the command.

kextunload -f --bundle-id com.example.kext

Is it possible to display verbose information while unloading a kernel extension with kextunload?

Yes, you can use the ‘-v’ flag to display verbose information while unloading a kernel extension.

kextunload -v --bundle-id com.example.kext

What should I be cautious about when using kextunload in MacOS?

When using kextunload, be cautious about unloading critical kernel extensions that are necessary for system stability. Improper unloading of essential extensions can lead to system instability or crashes.

Applications of the kextunload command

• Unload a currently loaded kernel extension
• Troubleshoot issues related to a specific kernel extension
• Prepare for updating or replacing a kernel extension
• Disable a problematic kernel extension temporarily