worms —
animate worms on a display terminal
  
    | worms | [ -ft] [-ddelay] [-llength] [-nnumber] | 
worms is a UNIX version of the
  DEC-2136 program “worms”.
The options are as follows:
  - -ddelay
- Specifies delay as a delay, in milliseconds, between
      each update. This is useful for fast terminals. Reasonable values are
      around 20-200; the default is 0.
- -f
- Makes a “field” for the worm(s) to eat.
- -llength
- Specifies length as a length for each worm; the
      default is 16.
- -nnumber
- Specifies number as the number of worms; the default
      is 3.
- -t
- Makes each worm leave a trail behind it.