df — Disk Free and Usage report
df command display the amount of disk space available on the FileSystem (FS) containing each file name argument. If no file name is given, the space available on all currently mounted Filesystems are shown.
$ df — Usage report of all mounted FS.
$ df myfile — Display usage report of FS which contain
$ df /home — Usage report of Home partition
$ df /dev/hda1 — Usage report of /dev/hda1
$ df -Th — Display the partition type and size is in human
$ df -x tmpfs — Don’t list the ‘tmpfs’ partitions.
$ df -P — Output in POSIX format. (Remove -P and see the
Read: man df