[test]$ cat devices Character devices:

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[test]$ cat devices
Character devices:
1 mem
4 /dev/vc/0
4 tty
4 ttyS
5 /dev/tty
5 /dev/console
5 /dev/ptmx
7 vcs
10 misc
13 input
21 sg
29 fb
128 ptm
136 pts
162 raw
180 usb
189 usb_device
202 cpu/msr
203 cpu/cpuid
252 megaraid_sas_ioctl
253 nvme
254 bsg

Block devices:
1 ramdisk
3 ide0
259 blkext
8 sd
9 md
22 ide1
65 sd
66 sd
67 sd
252 device-mapper
253 nvme
254 mdp
[test]$
[test]$ cd /dev
[test]$ ls -l
total 0
crw------- 1 root root

254,

0 May 9 2017 0:2:0:0
drwxr-xr-x 2 root root

540 May 9 2017 block
drwxr-xr-x 2 root root

60 May 9 2017 bsg
drwxr-xr-x 3 root root

60 May 9 2017 bus
drwxr-xr-x 2 root root

2980 May 9 2017 char
crw------- 1 root root

1 May 9 2017 console
lrwxrwxrwx 1 root root

11 May 9 2017 core -> /proc/kcore
drwxr-xr-x 18 root root

380 May 9 2017 cpu
crw------- 1 root root

203,

0 May 9 2017 cpu0
crw------- 1 root root

203,

1 May 9 2017 cpu1
crw------- 1 root root

203, 10 May 9 2017 cpu10
crw------- 1 root root

203, 11 May 9 2017 cpu11
crw------- 1 root root

203, 12 May 9 2017 cpu12
crw------- 1 root root

203,

8 May 9 2017 cpu8
crw------- 1 root root

203,

9 May 9 2017 cpu9
crw-rw---- 1 root root

10, 61 May 9 2017 cpu_dma_latency
drwxr-xr-x 4 root root

80 May 9 2017 disk
lrwxrwxrwx 1 root root

13 May 9 2017 fd -> /proc/self/fd
crw-rw-rw- 1 root root

7 May 9 2017 full
crw-rw-rw- 1 root root

10, 229 May 9 2017 fuse
drwxr-xr-x 2 root root

40 May 9 2017 hugepages
crw------- 1 root root

89,

0 May 9 2017 i2c-0
crw------- 1 root root

89,

1 May 9 2017 i2c-1
crw------- 1 root root

89,

2 May 9 2017 i2c-2
brw-r----- 1 root disk

4 May 9 2017 loop4
lrwxrwxrwx 1 root root

13 May 9 2017 MAKEDEV -> /sbin/MAKEDEV
drwxr-xr-x 2 root root

60 May 9 2017 mapper
crw-rw---- 1 root root

10, 227 May 9 2017 mcelog
crw-rw---- 1 root root

10, 62 May 9 2017 megadev0
cr-------- 1 root root

252,

0 May 9 2017 megaraid_sas_ioctl_node
crw-r----- 1 root kmem

1 May 9 2017 mem
crw------- 1 root root

13, 63 May 9 2017 mice
crw-rw---- 1 root root

10, 221 May 9 2017 mpt2ctl

crw------- 1 root root

202,

8 May 9 2017 msr8
crw------- 1 root root

202,

9 May 9 2017 msr9
drwxr-xr-x 2 root root

60 May 9 2017 net
crw-rw---- 1 root root

10, 60 May 9 2017 network_latency
crw-rw---- 1 root root

10, 59 May 9 2017 network_throughput
crw-rw-rw- 1 root root

3 May 9 2017 null
crw-rw---- 1 root root

1, 12 May 9 2017 oldmem
crw-r----- 1 root kmem

4 May 9 2017 port
crw------- 1 root root

108,

0 May 9 2017 ppp
crw-rw-rw- 1 root tty

2 Aug 8 23:45 ptmx
drwxr-xr-x 2 root root

0 May 9 2017 pts
brw-rw---- 1 root disk

0 May 9 2017 ram0
brw-rw---- 1 root disk

1 May 9 2017 ram1
brw-rw---- 1 root disk

1, 10 May 9 2017 ram10
crw-rw-rw- 1 root tty

0 Aug 7 16:01 tty
crw--w---- 1 root tty

0 May 9 2017 tty0
crw------- 1 root root

1 May 9 2017 tty1
crw--w---- 1 root tty

4, 10 May 9 2017 tty10
crw--w---- 1 root tty

4, 11 May 9 2017 tty11
crw--w---- 1 root tty

4, 12 May 9 2017 tty12
crw--w---- 1 root tty

4, 13 May 9 2017 tty13
crw--w---- 1 root tty

4, 14 May 9 2017 tty14
crw--w---- 1 root tty

4, 15 May 9 2017 tty15
.......
[test]$
以 'c' 开头的一行表示该设备是一个字符设备，以 'b' 开头的行表示这是一个块设备。
10,175 这两个数字中，前面的 10 表示 major number，后面的 175 表示 minor number。
fd：软驱
hd：IDE 磁盘
sd：SCSI 磁盘
tty：terminals
vd：virtio 磁盘

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