Show the status of modules in the Linux Kernel
The lsmod command is used to display the status information of modules that have been loaded into the kernel. Executing lsmod will list all modules currently loaded into the system. The Linux kernel is modular, meaning not all functions need to be built directly into the kernel core. Functions can be compiled as separate modules and loaded into the kernel when needed.
lsmod
[root@LinServ-1 ~]# lsmod
Module Size Used by
ipv6 272801 15
xfrm_nalgo 13381 1 ipv6
crypto_api 12609 1 xfrm_nalgo
ip_conntrack_ftp 11569 0
xt_limit 6721 2
xt_state 6209 2
ip_conntrack 53665 2 ip_conntrack_ftp,xt_state
nfnetlink 10713 1 ip_conntrack
xt_tcpudp 7105 6
xt_multiport 7233 1
iptable_filter 7105 1
ip_tables 17029 1 iptable_filter
x_tables 17349 5 xt_limit,xt_state,xt_tcpudp,xt_multiport,ip_tables
dm_mirror 24393 0
dm_multipath 27213 0
scsi_dh 12481 1 dm_multipath
video 21193 0
backlight 10049 1 video
sbs 18533 0
power_meter 16461 0
hwmon 7365 1 power_meter
i2c_ec 9025 1 sbs
dell_wmi 8401 0
wmi 12137 1 dell_wmi
button 10705 0
battery 13637 0
asus_acpi 19289 0
ac 9157 0
lp 15849 0
snd_hda_intel 401453 0
snd_seq_dummy 7877 0
snd_seq_oss 32577 0
snd_seq_midi_event 11073 1 snd_seq_oss
snd_seq 49585 5 snd_seq_dummy,snd_seq_oss,snd_seq_midi_event
snd_seq_device 11725 3 snd_seq_dummy,snd_seq_oss,snd_seq
snd_pcm_oss 42817 0
snd_mixer_oss 19009 1 snd_pcm_oss
snd_pcm 72517 2 snd_hda_intel,snd_pcm_oss
ide_cd 40161 0
snd_timer 24517 2 snd_seq,snd_pcm
tpm_tis 16713 0
r8169 43077 0
snd_page_alloc 14281 2 snd_hda_intel,snd_pcm
tpm 19041 1 tpm_tis
i2c_i801 12737 0
mii 9409 1 r8169
serio_raw 10693 0
i2c_core 24897 2 i2c_ec,i2c_i801
snd_hwdep 12869 1 snd_hda_intel
tpm_bios 11073 1 tpm
cdrom 36577 1 ide_cd
pcspkr 7105 0
parport_pc 29669 1
sg 36973 0
snd 57797 9 snd_hda_intel,snd_seq_oss,snd_seq,snd_seq_device,snd_pcm_oss,snd_mixer_oss,snd_pcm,snd_timer,snd_hwdep
parport 37513 2 lp,parport_pc
soundcore 11553 1 snd
dm_raid45 67273 0
dm_message 6977 1 dm_raid45
dm_region_hash 15681 1 dm_raid45
dm_log 14785 3 dm_mirror,dm_raid45,dm_region_hash
dm_mod 63993 4 dm_mirror,dm_multipath,dm_raid45,dm_log
dm_mem_cache 9537 1 dm_raid45
ata_piix 23749 4
libata 158085 1 ata_piix
sd_mod 25409 6
scsi_mod 144277 4 scsi_dh,sg,libata,sd_mod
ext3 126281 3
jbd 57705 1 ext3
uhci_hcd 25421 0
ohci_hcd 24937 0
ehci_hcd 34509 0
Typically, lsmod is used with grep to check if a specific module is loaded, for example: lsmod | grep -i ext3.