fish: New command 'sparse', like 'alloc' but to generate sparse files.

fish: New command 'sparse', like 'alloc' but to generate sparse files.

With sparse you can make sparse files, which is fun because you
can experiment with really large devices:

  ><fs> sparse /tmp/test.img 100G
  ><fs> run
  ><fs> sfdiskM /dev/vda ,
  ><fs> mkfs ext2 /dev/vda1    # very long pause here ...
  ><fs> mount /dev/vda1 /

To see the real (ie. allocated) size of the sparse file, use the du
command, eg:

  ><fs> !du -h /tmp/test.img
  1.6G -rw-rw-r-- 1 rjones rjones 100G 2009-11-04 17:40 /tmp/test.img