df command in Linux with Examples
The df command (short for disk free), is used to display information related to file systems about total space and available space.
Syntax :
df [OPTION]... [FILE]...
If no file name is given, it displays the space available on all currently mounted file systems.
For example :
df
Output :
Filesystem 1K-blocks Used Available Use% Mounted on udev 3996816 0 3996816 0% /dev tmpfs 804624 10020 794604 2% /run /dev/sda9 68117056 18036160 46597712 28% / tmpfs 4023116 29848 3993268 1% /dev/shm tmpfs 5120 4 5116 1% /run/lock tmpfs 4023116 0 4023116 0% /sys/fs/cgroup /dev/loop0 88832 88832 0 100% /snap/simplescreenrecorder/1 /dev/loop2 85888 85888 0 100% /snap/core/3748 /dev/loop3 85888 85888 0 100% /snap/core/3604 /dev/loop1 83328 83328 0 100% /snap/core/3887 /dev/sda10 78873504 67530504 7313356 91% /home /dev/sda1 507904 30908 476996 7% /boot/efi tmpfs 804624 12 804612 1% /run/user/121 tmpfs 804624 64 804560 1% /run/user/1000
Now, if you specify particular file, then it will show mount information of that particular file.
For example:
df /home/mandeep/test/test.cpp
Output :
Filesystem 1K-blocks Used Available Use% Mounted on /dev/sda10 78873504 67528220 7315640 91% /home
Options for df command :
-a, –all : includes pseudo, duplicate and inaccessible file systems.
-B, –block-size=SIZE : scales sizes by SIZE before printing them.
-h, –human-readable : print sizes in power of 1024
-H, –si: print sizes in power of 1000
-i, –inodes : list inode information instead of block usage
-l, –local : limit listing to local file systems
-P, –portability : use POSIX output format
–sync : invoke sync before getting usage info
–total : elide all entries insignificant to available space, and produce grand total
-t, –type=TYPE : limit listing to file systems of type TYPE
-T, –print-type : print file system type
df usage Examples with options :
- If you want to display all the file system, use -a option.
df -a
Output :
/dev/sda10 78873504 67528540 7315320 91% /home /dev/sda1 507904 30908 476996 7% /boot/efi tmpfs 804624 12 804612 1% /run/user/121 tmpfs 804624 64 804560 1% /run/user/1000 gvfsd-fuse 0 0 0 - /run/user/1000/gvfs
The above is not complete output, but you can see that the information shown is extended to info provided by df command.
- Use -h option to display size in power of 1024
df -h /home/mandeep
Output :
Filesystem Size Used Avail Use% Mounted on /dev/sda10 76G 65G 7.0G 91% /home
- Use -H option to display sizes in power of 1000
df -H /home/mandeep
Output :
Filesystem Size Used Avail Use% Mounted on /dev/sda10 81G 70G 7.5G 91% /home
You can observe the size section of two command with -h and -H option for difference.
- To get complete grand total, use –total option
df --total
Output :
Filesystem 1K-blocks Used Available Use% Mounted on udev 3996816 0 3996816 0% /dev tmpfs 804624 10072 794552 2% /run /dev/sda9 68117056 18036336 46597536 28% / tmpfs 4023116 50140 3972976 2% /dev/shm tmpfs 5120 4 5116 1% /run/lock tmpfs 4023116 0 4023116 0% /sys/fs/cgroup /dev/loop0 88832 88832 0 100% /snap/simplescreenrecorder/1 /dev/loop2 85888 85888 0 100% /snap/core/3748 /dev/loop3 85888 85888 0 100% /snap/core/3604 /dev/loop1 83328 83328 0 100% /snap/core/3887 /dev/sda10 78873504 67529320 7314540 91% /home /dev/sda1 507904 30908 476996 7% /boot/efi tmpfs 804624 12 804612 1% /run/user/121 tmpfs 804624 64 804560 1% /run/user/1000 total 162304440 86000792 68790820 56% -
Observe the last row of above table output, it specifies grand total.
- Use -T option to display file type
For example:df -T /home/mandeep
Output :
Filesystem Type 1K-blocks Used Available Use% Mounted on /dev/sda10 ext4 78873504 67528128 7315732 91% /home
You can see the file type for /home/mandeep is ext4.
- And for more help, you can use –help option.
df --help
References :
1) df wiki
2) Linux man page for df
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