Usage:
 fadvise [options] file
 fadvise [options] --fd|-d file-descriptor

Options:
 -a, --advice <advice> applying advice to the file (default: "dontneed")
 -d, --fd <num>        applying advice to the file descriptor
 -l, --length <num>    length for range operations, in bytes
 -o, --offset <num>    offset for range operations, in bytes

 -h, --help            display this help
 -V, --version         display version

Available values for advice:
  normal
  sequential
  random
  noreuse
  willneeded
  dontneed

For more details see fadvise(1).