df displays the amount of disk space available on the file system containing each file name argument. If no file name is given, the space available on all currently mounted file systems is shown. Disk space is shown in 1K blocks by default, unless the environment variable POSIXLY_CORRECT is set, in which case 512-byte blocks are used.
If an argument is the absolute file name of a disk device node containing a mounted file system, df shows the space available on that file system rather than on the file system containing the device node (which is always the root file system). This version of df cannot show the space available on unmounted file systems, because on most kinds of systems doing so requires very nonportable intimate knowledge of file system structures.
df [OPTION]... [FILE]...
[root@server1 ~]# df
Filesystem 1K-blocks Used Available Capacity Mounted on
/dev/mapper/vg_server3-lv_root
35929736 3581028 30523532 11% /
tmpfs 510980 0 510980 0% /dev/shm
/dev/sda1 495844 114624 355620 25% /boot
/dev/sdc1 240364032 59593724 168560440 27% /home
/dev/sdb1 115378728 1997504 107520260 2% /srv
Show information about the file system on which each FILE resides, or all file systems by default.
Mandatory arguments to long options are mandatory for short options too.
-a, --all include dummy file systems -B, --block-size=SIZE use SIZE-byte blocks --direct show statistics for a file instead of mount point --total produce a grand total -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