1 [02:11:41 root@centos8 ~]#lsb_release -a（#查看linux系统内核信息）
2 LSB Version: :core-4.1-amd64:core-4.1-noarch 3 Distributor ID: CentOS 4 Description: CentOS Linux release 8.3.2011 5 Release: 8.3.2011 6 Codename: n/a 7 [02:11:53 root@centos8 ~]#ll /dev/null 8 crw-rw-rw- 1 root root 1, 3 Jan 17 22:00 /dev/null 9 [02:15:24 root@centos8 ~]#ll /dev/null 10 crw-rw-rw- 1 root root 1, 3 Jan 17 22:00 /dev/null 11 [02:28:28 root@centos8 ~]# 12 [02:28:39 root@centos8 ~]#ll /dev/sda 13 brw-rw---- 1 root disk 8, 0 Jan 17 22:00 /dev/sda 14 [02:28:42 root@centos8 ~]#ll /dev/zero 15 crw-rw-rw- 1 root root 1, 5 Jan 17 22:00 /dev/zero 16 [02:28:51 root@centos8 ~]# 17 [02:28:52 root@centos8 ~]#ll /dev/sda* 18 brw-rw---- 1 root disk 8, 0 Jan 17 22:00 /dev/sda 19 brw-rw---- 1 root disk 8, 1 Jan 17 22:00 /dev/sda1 20 brw-rw---- 1 root disk 8, 2 Jan 17 22:00 /dev/sda2 21 brw-rw---- 1 root disk 8, 3 Jan 17 22:00 /dev/sda3 22 brw-rw---- 1 root disk 8, 4 Jan 17 22:00 /dev/sda4 23 brw-rw---- 1 root disk 8, 5 Jan 17 22:00 /dev/sda5
举例： 24 [02:29:24 root@centos8 ~]#cp /dev/zero /data/（#拷贝文件，拷贝一下就马上终止，不然硬盘会被撑满） 25 ^C 26 [02:29:53 root@centos8 ~]#ll /dev/zero /data/ 27 crw-rw-rw- 1 root root 1, 5 Jan 17 22:00 /dev/zero 28 29 /data/: 30 total 2982584 31 -rw-r--r-- 1 root root 709 Jan 18 00:36 f1.txt 32 -rw-r--r-- 1 root root 709 Jan 18 00:36 f22.txt 33 -rw-r--r-- 1 root root 709 Jan 18 00:36 f3.txt 34 -rw-r--r-- 1 root root 3054153728 Jan 18 02:29 zero
[02:39:02 root@centos8 ~]#ll /dev/zero /data/ -h crw-rw-rw- 1 root root 1, 5 Jan 17 22:00 /dev/zero /data/: total 2.9G -rw-r--r-- 1 root root 709 Jan 18 00:36 f1.txt -rw-r--r-- 1 root root 709 Jan 18 00:36 f22.txt -rw-r--r-- 1 root root 709 Jan 18 00:36 f3.txt -rw-r--r-- 1 root root 2.9G Jan 18 02:29 zero（#瞬间就有了2.9G文件） [02:39:14 root@centos8 ~]#
[02:41:07 root@centos8 ~]#hexdump -C /data/zero（#用二进制工具观察一下）
00000000 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
*
b60ab000 （#里面都是000，如果我不终止，不停的拷贝！）
[02:41:27 root@centos8 ~]#