wolf:~/public_html/links> clisp
  i i i i i i i       ooooo    o        ooooooo   ooooo   ooooo
  I I I I I I I      8     8   8           8     8     o  8    8
  I  \ `+' /  I      8         8           8     8        8    8
   \  `-+-'  /       8         8           8      ooooo   8oooo
    `-__|__-'        8         8           8           8  8
        |            8     o   8           8     o     8  8
  ------+------       ooooo    8oooooo  ooo8ooo   ooooo   8

Welcome to GNU CLISP 2.49 (2010-07-07) <http://clisp.cons.org/>

Copyright (c) Bruno Haible, Michael Stoll 1992, 1993
Copyright (c) Bruno Haible, Marcus Daniels 1994-1997
Copyright (c) Bruno Haible, Pierpaolo Bernardi, Sam Steingold 1998
Copyright (c) Bruno Haible, Sam Steingold 1999-2000
Copyright (c) Sam Steingold, Bruno Haible 2001-2010

Type :h and hit Enter for context help.

[1]> (load "perimeter_of_triangle.lsp")
;; Loading file perimeter_of_triangle.lsp ...
;; Loaded file perimeter_of_triangle.lsp
T
[2]> (perimeter 5.5 8.6 4.6 1.2 15.8 22.1)
48.14692
[3]> (perimeter 0 0 1 0 1 1)
3.4142137
[4]> (perimeter 1 1 2 2 3 3)
5.656854
[5]> (bye)
Bye.