df Command in Linux - Sanfoundry

This tutorial explains Linux “df” command, options and its usage with examples.

df – report file system disk space usage.

DESCRIPTION

Report how much free disk space is available for each mount you have.

SYNOPSIS

df [OPTION]… [FILE]…

OPTIONS

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-a, –all
include dummy file systems
-B, –block-size=SIZE
use SIZE-byte blocks
-h, –human-readable
print sizes in human readable format (e.g., 1K 234M 2G)
-H, –si
likewise, but use powers of 1000 not 1024
-i, –inodes
list inode information instead of block usage
-k
like –block-size=1K
-l, –local
limit listing to local file systems
–no-sync
do not invoke sync before getting usage info (default)
-P, –portability
use the POSIX output format
–sync
invoke sync before getting usage info
-t, –Type=Type
limit listing to file systems of type Type
-T, –print-Type
print file system type
-x, –exclude-Type=Type
limit listing to file systems not of type Type

EXAMPLES

1. Simple Example showing usage of df command

# df
 
Filesystem           1K-blocks      Used Available Use% Mounted on
/dev/cciss/c0d0p2     78361192  23185840  51130588  32% /
/dev/cciss/c0d0p5     24797380  22273432   1243972  95% /home
/dev/cciss/c0d0p3     29753588  25503792   2713984  91% /data
/dev/cciss/c0d0p1       295561     21531    258770   8% /boot
tmpfs                   257476         0    257476   0% /dev/shm

2. Display Information of all File System Disk Space Usage

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It also displays information of dummy file systems along with all the file system disk usage and their memory utilization.

# df -a
 
Filesystem           1K-blocks      Used Available Use% Mounted on
/dev/cciss/c0d0p2     78361192  23186116  51130312  32% /
proc                         0         0         0   -  /proc
sysfs                        0         0         0   -  /sys
devpts                       0         0         0   -  /dev/pts
/dev/cciss/c0d0p5     24797380  22273432   1243972  95% /home
/dev/cciss/c0d0p3     29753588  25503792   2713984  91% /data
/dev/cciss/c0d0p1       295561     21531    258770   8% /boot
tmpfs                   257476         0    257476   0% /dev/shm
none                         0         0         0   -  /proc/sys/fs/binfmt_misc
sunrpc                       0         0         0   -  /var/lib/nfs/rpc_pipefs

3. Display Disk Space Usage in Human Readable Format

It is done using -h option.

# df -h
 
Filesystem            Size  Used Avail Use% Mounted on
/dev/cciss/c0d0p2      75G   23G   49G  32% /
/dev/cciss/c0d0p5      24G   22G  1.2G  95% /home
/dev/cciss/c0d0p3      29G   25G  2.6G  91% /data
/dev/cciss/c0d0p1     289M   22M  253M   8% /boot
tmpfs                 252M     0  252M   0% /dev/shm

4. Display Information of /home

The output is also in human readable format and type is also displayed using the -T option.

# df -hT /home
 
Filesystem		Type    Size  Used Avail Use% Mounted on
/dev/cciss/c0d0p5	ext3     24G   22G  1.2G  95% /home

5. Display Information of File System in Bytes

To display all file system information and usage in 1024-byte blocks

# df -k
 
Filesystem           1K-blocks      Used Available Use% Mounted on
/dev/cciss/c0d0p2     78361192  23187212  51129216  32% /
/dev/cciss/c0d0p5     24797380  22273432   1243972  95% /home
/dev/cciss/c0d0p3     29753588  25503792   2713984  91% /data
/dev/cciss/c0d0p1       295561     21531    258770   8% /boot
tmpfs                   257476         0    257476   0% /dev/shm

6. Display Information of File System in MB

-m option is used for displaying information in MB.

# df -m
 
Filesystem           1M-blocks      Used Available Use% Mounted on
/dev/cciss/c0d0p2        76525     22644     49931  32% /
/dev/cciss/c0d0p5        24217     21752      1215  95% /home
/dev/cciss/c0d0p3        29057     24907      2651  91% /data
/dev/cciss/c0d0p1          289        22       253   8% /boot
tmpfs                      252         0       252   0% /dev/shm

7. Display File System Inodes

# df -i
 
Filesystem            Inodes   IUsed   IFree IUse% Mounted on
/dev/cciss/c0d0p2    20230848  133143 20097705    1% /
/dev/cciss/c0d0p5    6403712  798613 5605099   13% /home
/dev/cciss/c0d0p3    7685440 1388241 6297199   19% /data
/dev/cciss/c0d0p1      76304      40   76264    1% /boot
tmpfs                  64369       1   64368    1% /dev/shm

Using ‘-i‘ switch will display the information of number of used inodes and their percentage for the file system.

8. Display File System Type

File system type is displayed using -T option.

# df -T
 
Filesystem		Type   1K-blocks  Used      Available Use% Mounted on
/dev/cciss/c0d0p2	ext3    78361192  23188812  51127616  32%   /
/dev/cciss/c0d0p5	ext3    24797380  22273432  1243972   95%   /home
/dev/cciss/c0d0p3	ext3    29753588  25503792  2713984   91%   /data
/dev/cciss/c0d0p1	ext3    295561     21531    258770    8%    /boot
tmpfs			tmpfs   257476         0    257476    0%   /dev/shm

9. Exclude Certain File System Type

For example, the following command will only display other file systems types other than ext3.

# df -x ext3
 
Filesystem           1K-blocks      Used Available Use% Mounted on
tmpfs                   257476         0    257476   0% /dev/shm

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