[linux] 6 Ways to Check Hard Disk Disk Usage in Linux

1. df -lh command
df comes from the coreutils package, which comes with the system when it is installed; With this command, we can see the disk usage and where the file system is mounted;
[root@localhost ~]# df -l
File System Capacity Used Available Used % Mount Points
/dev/sda3              4956316   3565088   1135396 76% /
tmpfs                   241320         12    241308   1%   /dev/shm
/dev/sda6              4806904   2523708   2039012 56% /media/disk
/dev/sda1              4956284   3529796   1170656 76% /media/_
/dev/sda5              4845056   2581484   2019388 57% /media/disk-1
You can see that the system is hung on SDA3, and there are also three systems: SDA6/SDA1/SDA5.

Twofdisk-l command
fdisk is a powerful disk operation tool from the util-linux package, we will only talk about how to view disk partition table and partition structure here; Through the -l parameter, the partition status of all hard disks in the machine can be obtained.
[root@localhost ~]# fdisk -l
Disk /dev/sda: 40.0 GB, 40000000000 bytes
255 heads, 63 sectors/track, 4863 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk identifier: 0x62a9f8d0
   Device Boot      Start         End      Blocks   Id System
/dev/sda1   *           1         637     5116671   83 Linux
/dev/sda2             638         891     2040255   82 Linux swap / Solaris
/dev/sda3             892        1528     5116702+ 83 Linux
/dev/sda4            1529        2744     9767520    5 Extended
/dev/sda5            1529        2136     4883728+ 83 Linux
/dev/sda6            2137        2744     4883728+ 83 Linux
sda1 is the partition where the MBR (Master Boot Record) is located; sda2 isExchange partitions； sda4 isExtended partitions, including two logical partitions, SDA5 and SDA6. When the system divides partitions, it can only divide 4 main partitions (extended partitions are also considered primary partitions), I divided 3 main partitions + 1 Extended partition above, and 5.6 is logical partition. That's why there is SDA1.2.3.4.5.6. If you only divide 1 main partition + 1 extended partition, then the logical partition starts with SDA5, SDA1.2.5.6...

3. cfdisk -ps command (note that P is capitalized)
CFDisk is also a good partitioning tool; In some distributions, this tool has been removed from the util-linux package; CFDiDisk is characterized by its simplicity and ease of use;
ViewDisk partitionsThe usage of cfdisk -ps disk device name can also be used with cfdisk -ps for only one hard drive
Example 1: [root@localhost ~]# cfdisk -ps
Partition Table for /dev/sda
                First         Last
# Type        Sector      Sector       Offset     Length      Filesystem Type         (ID) Flag
-- -------   ----------- -----------    ------   ----------- --------------------      －－－----
1 Primary           0     10233404     63      10233405         Linux (83)             Boot
2 Primary    10233405    14313914      0       4080510       Linux swap / So (82)    None
3 Primary    14313915    24547319      0      10233405         Linux (83)             None
4 Primary    24547320    44082359      0      19535040       Extended (05)           None
5 Logical    24547320     34314839     63       9767520        Linux (83)             None
6 Logical    34314840    44082359     63       9767520         Linux (83)             None
   Logical    44082360    78124094      0      34041735         Free Space            None
Example 2: [root@localhost ~]# cfdisk -Ps /dev/sda
Partition Table for /dev/sda
               First       Last
# Type       Sector      Sector   Offset    Length   Filesystem Type (ID) Flag
-- ------- ----------- ----------- ------ ----------- -------------------- ----
1 Primary           0    10233404     63    10233405 Linux (83)           Boot
2 Primary    10233405    14313914      0     4080510 Linux swap / So (82) None
3 Primary    14313915    24547319      0    10233405 Linux (83)           None
4 Primary    24547320    44082359      0    19535040 Extended (05)        None
5 Logical    24547320    34314839     63     9767520 Linux (83)           None
6 Logical    34314840    44082359     63     9767520 Linux (83)           None
   Logical    44082360    78124094      0    34041735 Free Space           None

4. Orders to parted
parted partitioning tool with good function; In Fedora 8, there is a strap, you can install it yourself; The calling method is simple, parted is the default open device is /dev/hda, or you can specify it yourself; For example, parted /dev/hda or /dev/sda, etc.; The way to quit is quit
After entering the parted command, it will take a while for the following content to appear:
[root@localhost ~]# parted
GNU Parted 1.8.6
Use /dev/sda
Welcome to GNU Parted! Type ’help’ to view a list of commands.
(parted)  
Enter p in the cursor and the following content appears:
Model: ATA Maxtor 5T040H4 (scsi)
Disk /dev/sda: 40.0GB
Sector size (logical/physical): 512B/512B
Partition Table: msdos
Number Start End S ize Type File system flag
1 32.3kB 5240MB 5239MB primary partition ext3 booted
2 5240MB 7329MB 2089MB primary partition linux-swap        
3 7329MB 12.6GB 5240MB main partition ext3              
4 12.6GB 22.6GB 10.0GB Extended Partition                    
5 12.6GB 17.6GB 5001MB logical partition ext3              
6 17.6GB 22.6GB 5001MB logical partition ext3              
(parted)

Type quit after the cursor to exit.
5. sfdisk -l
[root@localhost ~]# sfdisk -l
Disk /dev/sda: 4863 cylinders, 255 heads, 63 sectors/track
Units = cylinders of 8225280 bytes, blocks of 1024 bytes, counting from 0
   Device Boot Start     End   #cyls    #blocks   Id System
/dev/sda1   *      0+    636     637-   5116671   83 Linux
/dev/sda2        637     890     254    2040255   82 Linux swap / Solaris
/dev/sda3        891    1527     637    5116702+ 83 Linux
/dev/sda4       1528    2743    1216    9767520    5 Extended
/dev/sda5       1528+   2135     608-   4883728+ 83 Linux
/dev/sda6       2136+   2743     608-   4883728+ 83 Linux

6. You can also use the application > system tools > disk usage analyzer to check the disk usage.