A file system view command df
format
df [options] [mount point]
Options
| name | effect |
|---|---|
| -a | Show all file system information, including specific file system, such as / proc, / sysfs |
| -h | Capacity usage display unit, such as KB, MB, or the like GB |
| -T | Displays the file system type |
| -m | Display capacity in MB |
| -k | In KB display capacity, the default is in KB |
Examples
# df命令
[root@izm5e2q95pbpe1hh0kkwoiz tmp]# df
Filesystem 1K-blocks Used Available Use% Mounted on
/dev/vda1 41151808 13866168 25172208 36% /
devtmpfs 932240 0 932240 0% /dev
tmpfs 941744 0 941744 0% /dev/shm
tmpfs 941744 492 941252 1% /run
tmpfs 941744 0 941744 0% /sys/fs/cgroup
tmpfs 188352 0 188352 0% /run/user/0
[root@izm5e2q95pbpe1hh0kkwoiz tmp]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/vda1 40G 14G 25G 36% /
devtmpfs 911M 0 911M 0% /dev
tmpfs 920M 0 920M 0% /dev/shm
tmpfs 920M 492K 920M 1% /run
tmpfs 920M 0 920M 0% /sys/fs/cgroup
tmpfs 184M 0 184M 0% /run/user/0
II. Statistical directory or file size
format
du [options] [directory or file name]
Options
| Options | effect |
|---|---|
| -a | Show disk usage of each sub-file. The default disk usage statistics only subdirectories |
| -h | Habits displays disk footprint, such as KB, MB or GB, etc. |
| -s | Statistics footprint without listing footprint subdirectories and sub-files |
Examples
[root@izm5e2q95pbpe1hh0kkwoiz tmp]# du -h
4.0K ./.font-unix
4.0K ./.ICE-unix
4.0K ./.X11-unix
4.0K ./.XIM-unix
36K ./hsperfdata_root
4.0K ./systemd-private-9255c5ee9ec84f5987c1d9ba485e177e-ntpd.service-eKcnmD/tmp
8.0K ./systemd-private-9255c5ee9ec84f5987c1d9ba485e177e-ntpd.service-eKcnmD
4.0K ./.Test-unix
512K .
[root@izm5e2q95pbpe1hh0kkwoiz tmp]# du -sh
512K .
The difference between du and df command command
df command space than statistical du command statistics of a large space !!!!
占用的空间(最常见的就是文件已经删除,但是程序并没有释放空间)
du命令是面向文件的,只会计算文件或目录占用的空间III. Fsck command to repair the file system
format
fsck [options] partition device file name
The system automatically performs the boot
Options
| Options | effect |
|---|---|
| -a | Without user prompts, Automatically fix file system |
| -Y | Auto repair Consistent action and -a, but some file system supports only -y |
IV. The disk status display command dumpe2fs
format
dumpe2fs partition device file name
Examples
[root@izm5e2q95pbpe1hh0kkwoiz tmp]# df
Filesystem 1K-blocks Used Available Use% Mounted on
/dev/vda1 41151808 13866916 25171460 36% /
devtmpfs 932240 0 932240 0% /dev
tmpfs 941744 0 941744 0% /dev/shm
tmpfs 941744 492 941252 1% /run
tmpfs 941744 0 941744 0% /sys/fs/cgroup
tmpfs 188352 0 188352 0% /run/user/0
[root@izm5e2q95pbpe1hh0kkwoiz tmp]# dumpe2fs /dev/vda1
dumpe2fs 1.42.9 (28-Dec-2013)
Filesystem volume name: <none>
Last mounted on: /
Filesystem UUID: eb448abb-3012-4d8d-bcde-94434d586a31
Filesystem magic number: 0xEF53
Filesystem revision #: 1 (dynamic)
Filesystem features: has_journal ext_attr resize_inode dir_index filetype needs_recovery extent flex_bg sparse_super large_file huge_file uninit_bg dir_nlink extra_isize
Filesystem flags: signed_directory_hash
Default mount options: user_xattr acl
Filesystem state: clean
Errors behavior: Continue
Filesystem OS type: Linux
Inode count: 2621440
Block count: 10485248
Reserved block count: 524262
Free blocks: 8958387
Free inodes: 2519237
First block: 0
Block size: 4096
Fragment size: 4096
Reserved GDT blocks: 1021
Blocks per group: 32768
Fragments per group: 32768
Inodes per group: 8192
Inode blocks per group: 512
RAID stride: 32639
Flex block group size: 16
Filesystem created: Sun Oct 15 23:18:59 2017
Last mount time: Tue Aug 14 10:15:43 2018
Last write time: Tue Aug 14 18:15:42 2018
Mount count: 6
Maximum mount count: -1
Last checked: Wed Jun 27 22:35:57 2018
Check interval: 0 (<none>)
Lifetime writes: 30 GB
Reserved blocks uid: 0 (user root)
Reserved blocks gid: 0 (group root)
First inode: 11
Inode size: 256
Required extra isize: 28
Desired extra isize: 28
Journal inode: 8
First orphan inode: 1050280
Default directory hash: half_md4
Directory Hash Seed: 2579899c-6862-4625-a8e6-425550384200
Journal backup: inode blocks
Journal features: journal_incompat_revoke
Journal size: 128M
Journal length: 32768
Journal sequence: 0x006d2f6d
Journal start: 5782
......