Overview
rmmod provides the functionality to safely unload loaded modules from the Linux kernel. It performs dependency checks during module removal, which helps maintain system stability.
Key Features
- Unload kernel modules
- Automatic checking and handling of module dependencies
- Used for system resource management and troubleshooting
Key Options
These are the main options that can be used with the rmmod command.
Controlling Removal Behavior
Output and Debugging
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Description:
`rmmod` Executes the command.
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Usage Examples
Here are various examples of how to use the rmmod command.
Basic Module Removal
sudo rmmod module_nameRemoves the specified module from the kernel. The module must not be in use or depended upon by other modules.
Force Module Removal
sudo rmmod -f module_nameAttempts to force the removal of a module, even if it is in use or has dependencies. Be cautious as this can cause system issues.
Remove Module with Verbose Output
sudo rmmod -v module_nameRemoves the module while displaying detailed output of the removal process.
Tips & Precautions
Useful tips and precautions to consider when using the rmmod command.
Things to Check Before Use
- **Check Dependencies**: Before removing a module, it's advisable to check if it's depended upon by other modules using the `lsmod` command.
- **In-Use Modules**: Modules currently in use by the system cannot be removed. Attempting to remove one will result in an error message like 'Module is in use'.
- **Root Privileges**: The rmmod command requires root privileges, such as those obtained with `sudo`, as it deals with kernel modules.
Caution When Using Force Removal (-f)
- The `-f` option attempts to remove a module by ignoring its dependencies or usage status. This can lead to system instability or data loss, so it should only be used cautiously and when absolutely necessary.
- Forcibly removing critical system modules can render the system inoperable.