Linux and Unix df command
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About df
Syntax
Examples
Related commands
Linux and Unix main page
Report how much free disk space is available for each mount you have.
df [OPTION]... [FILE]...
| -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 |
| --version | output version information and exit |
df
In the above example when performing just the df command with no additional switches or specification of the file or directory you would get a listing of all file systems and their used and available space.
df -h
The above command is one of the most commonly used commands as it displays the sizes in an easy to read format as shown in the below example.
| Filesystem | Size | Used | Avail | Use% | Mounted on |
| /dev/hda2 | 28G | 7.6G | 19G | 29% | / |
| tmpfs | 252M | 0 | 252M | 0% | /lib/init/rw |
| tmpfs | 252M | 0 | 252M | 0% | /dev/shm |
| /dev/hda1 | 464M | 37M | 403M | 9% | /boot |
| /dev/hda3 | 8.3G | 429M | 7.5G | 6% | /var |
| nfs6:/home | 520G | 461G | 60G | 89% | /home |
| mirrors:/mirrors | 1.4T | 1.1T | 233G | 83% | /mirrors |
| /dev/mapper/big-phat | 77G | 36G | 42G | 46% | /space |
| mailstore:/var/mail | 9.9G | 4.8G | 4.7G | 51% | /var/mail |
df -b public_html
In the above example this command would display the amount of free space in the public_html directory. Below is an example of the output may display when performing this command.
Filesystem avail
nfs.computerhope.com:/home 10068252