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DarkLinkXXXX
This can already be done with gnuplot though. Does guff have any advantages?

   gnuplot> set term dumb size 89,30 aspect 1      
   Terminal type set to 'dumb'
   Options are 'feed  size 89, 30 aspect 1, 1'
   gnuplot> plot [-5:6.5] sin(x) with impulse ls -1


    1 ++-----+-------------+------------+-------------+-------------+-------------+-++
      ||||++ +             +            +       ++||||+             +             +  |
  0.8 ++||||+                                  +|||||||+               sin(x) +----+++
      |||||||+                                ++||||||||+                            |
      ||||||||+                               |||||||||||+                           |
  0.6 ++|||||||                              +||||||||||||                          ++
      |||||||||+                            +|||||||||||||+                          |
  0.4 ++||||||||+                           +||||||||||||||+                        ++
      |||||||||||                          +||||||||||||||||                         |
      |||||||||||                          |||||||||||||||||+                        |
  0.2 ++|||||||||+                        +||||||||||||||||||                       ++
      ||||||||||||+                      +|||||||||||||||||||+                      +|
    0 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
      |            +|||||||||||||||||||||                      ||||||||||||||||||||| |
      |             +|||||||||||||||||||+                      +|||||||||||||||||||+ |
 -0.2 ++            +||||||||||||||||||+                       +||||||||||||||||||| ++
      |              ||||||||||||||||||                         ||||||||||||||||||+  |
      |              +||||||||||||||||+                         +||||||||||||||||+   |
 -0.4 ++              +||||||||||||||+                           +||||||||||||||+   ++
      |                +|||||||||||||                             +|||||||||||||     |
 -0.6 ++                |||||||||||||                              +||||||||||||    ++
      |                 +|||||||||||+                              +|||||||||||+     |
 -0.8 ++                +||||||||||+                                +|||||||||+     ++
      |                  ++||||||++                                  +||||||++       |
      |      +             ++|||+       +             +             + ++||||      +  |
   -1 ++-----+-------------+------------+-------------+-------------+-------------+-++
            -4            -2            0             2             4             6
herge
Guff can be used from the command line in a pipe?
michaelmior
You could accomplish this in gnuplot, but guff does have some nice defaults that don't require you to write a script before you do the plotting.
c3RlcGhlbnI_
Apparently so can gnuplot, however the syntax is really awful.

    awk 'BEGIN{ for(x=-5;x<6.5;x+=0.1){printf("%s\t%f\n", x, sin(x))} }' \
      | gnuplot -p -e "set term dumb size 89,30 aspect 1;plot '<cat'"
Gnuplot really isn't made for that kind of usage, so guff does fill a valuable niche. Though you could also just write a wrapper around gnuplot with an interface that works better for command line usage(this probably already exists).