How to determine if a specific module is loaded in linux kernel

Question

I am just curious is there any way to determine if a particular module is loaded/installed.

$lsmod lists all modules (device driver loaded).

Is there any way to

Answer 1

The better idea is to create a bash function:

#!/bin/sh
function moduleExist(){
  MODULE="$1"
  if lsmod | grep "$MODULE" &> /dev/null ; then
    return 0
  else
    return 1
  fi
}


if moduleExist "module name"; then
  #do somthing
fi

Answer 2

module list 

Returns:

Currently Loaded Modulefiles:
  1) /coverm/0.3.0        2) /parallel/20180222

Answer 3

The modinfo module method does not work well for me. I prefer this method that is similar to the alternative method proposed:

#!/bin/sh

MODULE="$1"

if lsmod | grep "$MODULE" &> /dev/null ; then
  echo "$MODULE is loaded!"
  exit 0
else
  echo "$MODULE is not loaded!"
  exit 1
fi

Answer 4

grep -wEq "^${module%.o}" /proc/modules

returns true (e.g. can be used in an if) whether you ask for keyboard or keyboard.o

Answer 5

I wrote this:

MODULE=snd_aloop # for example
test -n "$(grep -e "^$MODULE " /proc/modules)" && echo "Loaded" || echo "Not loaded"

It checks in /proc/modules. If the module is mentioned there, it's assumed to be loaded, otherwise not.

The others seemed too long to me (the other short one requires root, this does not). Of course it's just written out what was already mentioned as "alternatives".

Caution: modprobe accepts some variants of module names other than the primary listed in /proc/modules. For example loading snd-aloop works, but the module is named snd_aloop and is listed as such in /proc/modules and when using rmmod that's also the only name that will work.

Answer 6

not sure if modinfo modname and checking $? will work for you, just a suggestion.

/tmp$ sudo modinfo e1000
/tmp$ echo $?
0
/tmp$ sudo modinfo keyboard
ERROR: modinfo: could not find module keyboard
/tmp$ echo $?
1

alternatively you also grep /proc/modules