$ df -k | head -3; perl -le 'print"$_:\t".(stat $_)[1]for@ARGV' / /dev  
Filesystem              1K-blocks     Used    Avail Capacity  Mounted on
/dev/disk0s9             58598824 39199392 19143432    67%    /
devfs                          96       96        0   100%    /dev
/:      2
/dev:   2