显示已载入系统的模块
lsmod命令 用于显示已经加载到内核中的模块的状态信息。执行lsmod命令后会列出所有已载入系统的模块。Linux操作系统的核心具有模块化的特性，应此在编译核心时，务须把全部的功能都放入核心。您可以将这些功能编译成一个个单独的模块，待需要时再分别载入。
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
通常在使用lsmod命令时，都会采用类似lsmod | grep -i ext3这样的命令来查询当前系统是否加载了某些模块。