Solaris

Filesystem            kbytes    used   avail capacity  Mounted on
/dev/dsk/c0t0d0s0    2055463 1753694  240106    88%    /
/proc                      0       0       0     0%    /proc
fd                         0       0       0     0%    /dev/fd
mnttab                     0       0       0     0%    /etc/mnttab
swap                 5569080      40 5569040     1%    /var/run
swap                 5621352   52312 5569040     1%    /tmp
/dev/dsk/c0t2d0s5    20165785 19919888   44240   100%    /data
/dev/dsk/c0t2d0s6    18310202 17401510  725590    96%    /data1

$ bc
bc 1.03 (Nov 2, 1994)
Copyright (C) 1991, 1992, 1993, 1994 Free Software Foundation, Inc.
This is free software with ABSOLUTELY NO WARRANTY.
For details type `warranty'.
scale=8
19919888 * 100 / (19919888 + 44240)
99.77840254
^D$