Rmmod Command in Linux
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The core component of each Linux operating system is the Linux kernel. It manages the system’s resources, and acts as an intermediary between the computer’s hardware and software.
The Linux kernel is a software that has a modular design. A kernel module, or often referred to as a driver, is a piece of code that extends the kernel’s functionality. Modules can be compiled as loadable modules or built into the kernel. Loadable modules can be dynamically loaded and unloaded in the running kernel on request, without the need to reboot the system.
In this article, we’ll talk about how to use the
rmmod command to remove modules from the Linux Kernel.
The general syntax for the
rmmod (remove module) command is as follows:
rmmod [OPTIONS] MODULE_NAME...
On modern Linux systems,
rmmod is part of
kmod, a binary that implements multiple programs used to manage Linux kernel modules.
Only users with administrative privileged can remove modules.
You can print a list of all modules loaded on your system with the
lsmod command. The Kernel modules are stored in the
Removing a module with the
rmmod command is pretty simple; simply invoke the command followed by the module name:
The command prints message only if something goes wrong. For example, if another module uses the module, the command will print something like this:
rmmod: ERROR: Module module_name is in use by: module_name_2
To display information about what the command is doing, use the
If you want to remove a module that is being used or not designed to be removed, invoke the command with the
--verbose) option. Using this option is extremely dangerous as it can cause a system crash.
rmmod also accepts multiple modules as arguments:
rmmod module_name1 module_name2
Prevent a Kernel Module from Loading at Boot-Time
When a module is removed using the
rmmod command, the module remains unloaded until the system is rebooted. On the next system boot, the removed module will be loaded.
To permanently disable a Kernel module from loading at boot-time, create a
.conf file with any name inside the
/etc/modprobe.d. The syntax is:
If you want to blacklist additional modules, specify the modules on a new line, or create a new
rmmod command is used to remove Linux kernel modules. Generally, most Linux users are using the
modprobe -r command instead of
Feel free to leave a comment if you have any questions.