conch:~% du -sk * | perl -MFoo -e k2m
  0.01M Foo.pm
  6.88M Mail
  0.18M Sent
  0.00M bin
  0.79M public_html
conch:~% ls -l | perl -MFoo -e b2k
total 394
-rw-r--r--  1 fox  guest   6.25K Oct 31 12:00 Foo.pm
drwx------  2 fox  guest   0.50K Oct 31 12:00 Mail
-rw-------  1 fox  guest 169.05K Oct 30 15:33 Sent
drwx------  2 fox  guest   0.50K Aug  3  2000 bin
drwxr-xr-x  4 fox  guest   0.50K Jul 17 17:38 public_html
conch:~% df -k | perl -MFoo -e k2g
Filesystem  1024-blocks     Used    Avail Capacity  Mounted on
/dev/sd0a         0.06G    0.02G    0.04G    35%    /
/dev/sd0h         1.89G    1.52G    0.28G    85%    /usr
/dev/sd0g         1.89G    0.87G    0.93G    48%    /var
/dev/sd0f         1.89G    0.87G    0.93G    48%    /usr/guest1
/dev/sd0e         0.71G    0.38G    0.29G    56%    /usr/msen
mfs:25            63471      116    60181     0%    /tmp