df command in linux allows to
see the amount of disk space that is free on the partitions in the current system.
This is by default shown in 1kb.
When we run df without any
arguments
[root@vx111a ~]# df
Filesystem 1K-blocks Used Available Use% Mounted on
/dev/sda6 19840892 653768 18162984 4% /
/dev/sda10 12254928 2490072 9132300
22% /dump
/dev/sda8 9920592 2572224
6836300 28% /usr
/dev/sda7 39674192 2500572
35125736 7% /soa
display information of all
file system with mount points too
[root@vx111a ~]# df -a
Filesystem 1K-blocks Used Available Use% Mounted on
/dev/sda6 19840892 654200
18162552 4% /
/dev/sda10 12254928 2490072 9132300 22% /dump
/dev/sda8 9920592 2572224
6836300 28% /usr
/dev/sda7 39674192 2500572
35125736 7% /soa
Normally we see the memory in
1kbs.we can change this options to show the memory in a different way like
[root@vx111a ~]# df -B 1000
Filesystem 1kB-blocks Used Available Use% Mounted on
/dev/sda6 20317074 669975
18598380 4% /
/dev/sda10 12549047 2549834 9351476
22% /dump
/dev/sda8 10158687 2633958
7000372 28% /usr
/dev/sda7 40626373 2560586
35968754 7% /soa
Here we have specified the
block size as 1000.
If we need to have them in
human readable format , we can use
[root@vx111a ~]# df -h
Filesystem Size Used
Avail Use% Mounted on
/dev/sda6 19G 640M
18G 4% /
/dev/sda10 12G 2.4G 8.8G 22% /dump
/dev/sda8 9.5G 2.5G 6.6G 28% /usr
/dev/sda7 38G
2.4G 34G 7% /soa
We can get the file system
type too using
[root@vx111a ~]# df -T
Filesystem Type
1K-blocks Used Available Use% Mounted on
/dev/sda6 ext3
19840892 654532
18162220 4% /
/dev/sda10 ext3
12254928 2490072
9132300 22% /dump
/dev/sda8 ext3
9920592 2572224
6836300 28% /usr
/dev/sda7 ext3
39674192 2500572
35125736 7% /soa
du: This command is normally
used for estimating the file space usage
[root@vx111a test]# du -h
64K
du -h displays the amount of
space used by the current directory .
If we need to get more detail
about the files in the current directory, we can use
[root@vx111a test]# du -ah
8.0K ./file2
8.0K ./file3
16K ./sam
8.0K ./anaconda-ks.cfg
8.0K ./file1
8.0K ./sample
64K .
If we need just the total
amount of space used, we can
[root@vx111a test]# du -c
64 .
64 total
There will be some stages
where you want to provide du with a input .in that case we can use ‘du -ah
--files0-from=-‘.When you run this command , you will be given a cursor to
enter input, enter any file name in the current directory like
du -ah --files0-from=-
sam 16K sam
Once you enter the file,
press ctrl + d twice in order to produce the output of the file.
du provides us an options
which allows to exclude particular files , we can use
[root@vx111a test]# du -cbha
--exclude="*.txt"
14 ./file2
14 ./file3
9.4K ./sam
1.4K ./anaconda-ks.cfg
14 ./file1
17 ./sample
15K .
15K total
More to Come, Happy Learning J
