modprobe(8)
NAME
modprobe - Add and remove modules from the Linux Kernel
SYNOPSIS
modprobe [-v] [-V] [-C config-file] [-n] [-i] [-q] [-b] [modulename]
[module parameters...]
modprobe [-r] [-v] [-n] [-i] [modulename...]
modprobe [-c]
modprobe [--dump-modversions] [filename]
DESCRIPTION
modprobe intelligently adds or removes a module from the Linux kernel:
note that for convenience, there is no difference between _ and - in
module names (automatic underscore conversion is performed). modprobe
looks in the module directory /lib/modules/`uname -r` for all the
modules and other files, except for the optional configuration files in
the /etc/modprobe.d directory (see modprobe.d(5)). modprobe will also
use module options specified on the kernel command line in the form of
<module>.<option> and blacklists in the form of
modprobe.blacklist=<module>.
Note that unlike in 2.4 series Linux kernels (which are not supported
by this tool) this version of modprobe does not do anything to the
module itself: the work of resolving symbols and understanding
parameters is done inside the kernel. So module failure is sometimes
accompanied by a kernel message: see dmesg(8).
modprobe expects an up-to-date modules.dep.bin file as generated by the
corresponding depmod utility shipped along with modprobe (see
depmod(8)). This file lists what other modules each module needs (if
any), and modprobe uses this to add or remove these dependencies
automatically.
If any arguments are given after the modulename, they are passed to the
kernel (in addition to any options listed in the configuration file).
OPTIONS
-a, --all
Insert all module names on the command line.
-b, --use-blacklist
This option causes modprobe to apply the blacklist commands in the
configuration files (if any) to module names as well. It is usually
used by udev(7).
-C, --config
This option overrides the default configuration directory
(/etc/modprobe.d).
This option is passed through install or remove commands to other
modprobe commands in the MODPROBE_OPTIONS environment variable.
-c, --showconfig
Dump out the effective configuration from the config directory and
exit.
--dump-modversions
Print out a list of module versioning information required by a
module. This option is commonly used by distributions in order to
package up a Linux kernel module using module versioning deps.
-d, --dirname
Root directory for modules, / by default.
--first-time
Normally, modprobe will succeed (and do nothing) if told to insert
a module which is already present or to remove a module which isn't
present. This is ideal for simple scripts; however, more
complicated scripts often want to know whether modprobe really did
something: this option makes modprobe fail in the case that it
actually didn't do anything.
--force-vermagic
Every module contains a small string containing important
information, such as the kernel and compiler versions. If a module
fails to load and the kernel complains that the "version magic"
doesn't match, you can use this option to remove it. Naturally,
this check is there for your protection, so this using option is
dangerous unless you know what you're doing.
This applies to any modules inserted: both the module (or alias) on
the command line and any modules on which it depends.
--force-modversion
When modules are compiled with CONFIG_MODVERSIONS set, a section
detailing the versions of every interfaced used by (or supplied by)
the module is created. If a module fails to load and the kernel
complains that the module disagrees about a version of some
interface, you can use "--force-modversion" to remove the version
information altogether. Naturally, this check is there for your
protection, so using this option is dangerous unless you know what
you're doing.
This applies any modules inserted: both the module (or alias) on
the command line and any modules on which it depends.
-f, --force
Try to strip any versioning information from the module which might
otherwise stop it from loading: this is the same as using both
--force-vermagic and --force-modversion. Naturally, these checks
are there for your protection, so using this option is dangerous
unless you know what you are doing.
This applies to any modules inserted: both the module (or alias) on
the command line and any modules it on which it depends.
-i, --ignore-install, --ignore-remove
This option causes modprobe to ignore install and remove commands
in the configuration file (if any) for the module specified on the
command line (any dependent modules are still subject to commands
set for them in the configuration file). Both install and remove
commands will currently be ignored when this option is used
regardless of whether the request was more specifically made with
only one or other (and not both) of --ignore-install or
--ignore-remove. See modprobe.d(5).
-n, --dry-run, --show
This option does everything but actually insert or delete the
modules (or run the install or remove commands). Combined with -v,
it is useful for debugging problems. For historical reasons both
--dry-run and --show actually mean the same thing and are
interchangeable.
-q, --quiet
With this flag, modprobe won't print an error message if you try to
remove or insert a module it can't find (and isn't an alias or
install/remove command). However, it will still return with a
non-zero exit status. The kernel uses this to opportunistically
probe for modules which might exist using request_module.
-R, --resolve-alias
Print all module names matching an alias. This can be useful for
debugging module alias problems.
-r, --remove
This option causes modprobe to remove rather than insert a module.
If the modules it depends on are also unused, modprobe will try to
remove them too. Unlike insertion, more than one module can be
specified on the command line (it does not make sense to specify
module parameters when removing modules).
There is usually no reason to remove modules, but some buggy
modules require it. Your distribution kernel may not have been
built to support removal of modules at all.
-S, --set-version
Set the kernel version, rather than using uname(2) to decide on the
kernel version (which dictates where to find the modules).
--show-depends
List the dependencies of a module (or alias), including the module
itself. This produces a (possibly empty) set of module filenames,
one per line, each starting with "insmod" and is typically used by
distributions to determine which modules to include when generating
initrd/initramfs images. Install commands which apply are shown
prefixed by "install". It does not run any of the install commands.
Note that modinfo(8) can be used to extract dependencies of a
module from the module itself, but knows nothing of aliases or
install commands.
-s, --syslog
This option causes any error messages to go through the syslog
mechanism (as LOG_DAEMON with level LOG_NOTICE) rather than to
standard error. This is also automatically enabled when stderr is
unavailable.
This option is passed through install or remove commands to other
modprobe commands in the MODPROBE_OPTIONS environment variable.
-V, --version
Show version of program and exit.
-v, --verbose
Print messages about what the program is doing. Usually modprobe
only prints messages if something goes wrong.
This option is passed through install or remove commands to other
modprobe commands in the MODPROBE_OPTIONS environment variable.
ENVIRONMENT
The MODPROBE_OPTIONS environment variable can also be used to pass
arguments to modprobe.
COPYRIGHT
This manual page originally Copyright 2002, Rusty Russell, IBM
Corporation. Maintained by Jon Masters and others.
SEE ALSO
modprobe.d(5), insmod(8), rmmod(8), lsmod(8), modinfo(8)
AUTHORS
Jon Masters <jcm@jonmasters.org>
Developer
Robby Workman <rworkman@slackware.com>
Developer
Lucas De Marchi <lucas.de.marchi@gmail.com>
Developer
Free and Open Source Software