Ordering options:
  -r, --reverse                 reverse the result of comparisons
      --according-to <word>     sort according to <word>
  -h, --head <num>              unsort the first <num> lines.
  -t, --tail <num>              unsort the last <num> lines.

Other options:
      --color <when>            use markers to highlight the matching strings
  -e, --exp <exp>               regular expression. sort by the entires match
  -u, --unique                  output only the first line of an equal
      --max-buffer <size>       max buffer size

  -H, --help        display this help and exit
  -V, --version     display version information and exit