当我执行任ls一目录时，它们的内容非常相似
/系统/类/块
$ ls /sys/class/block
dm-0 dm-3 loop1 loop4 loop7 ram10 ram13 ram2 ram5 ram8 sda1 sda4
dm-1 dm-4 loop2 loop5 ram0 ram11 ram14 ram3 ram6 ram9 sda2 sda5
dm-2 loop0 loop3 loop6 ram1 ram12 ram15 ram4 ram7 sda sda3 sda6
ls -lah /sys/class/block/
total 0
drwxr-xr-x 2 root root 0 Apr 23 16:08 .
drwxr-xr-x 52 root root 0 Apr 23 16:08 ..
lrwxrwxrwx 1 root root 0 Apr 23 16:08 dm-0 -> ../../devices/virtual/block/dm-0
lrwxrwxrwx 1 root …