1, File system view command df
format
df [options] [mount point]
option
| Name | Effect |
|---|---|
| -a | Display all file system information, including special file systems, such as / proc,/sysfs |
| -h | Display capacity in customary units, such as KB,MB or GB |
| -T | Show file system types |
| -m | Display capacity in MB |
| -k | Display capacity in kilobytes. The default is kilobytes |
Example
# df command [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
2, Count directory or file size
format
du [options] [directory or filename]
option
| option | Effect |
|---|---|
| -a | Display the disk usage of each sub file. By default, only the disk usage of subdirectories is counted |
| -h | Use custom units to display disk usage, such as KB,MB or GB |
| -s | Count the usage, not list the usage of subdirectories and sub files |
Example
[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 command and df command
df command statistics space is larger than du command statistics space!!!!
Space occupied (the most common is that the file has been deleted, but the program does not free space) The du command is file oriented and only calculates the space occupied by the file or directory
3, File system repair command fsck
format
fsck [options] partition device filename
Automatic execution of system startup
option
| option | Effect |
|---|---|
| -a | Automatically repair file system without user prompt |
| -y | Auto repair. Works the same as - a, but some file systems only support - y |
4, Display disk status command dumpe2fs
format
dumpe2fs partition device filename
Example
[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 ......