$gnuplot

        G N U P L O T
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Terminal type set to 'x11'
gnuplot>

gnuplot>help
 `gnuplot` is a command-driven interactive function and data plotting program.
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 Many `gnuplot` commands have multiple options.  These options must appear in
Press return for more: 

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Help topics available:
    batch/interactive bugs              commands          comments
    coordinates       copyright         environment       expressions
    glossary          graphical         help-desk         introduction
    line-editing      mouse             new-features      old_bugs
    plotting          set               show              startup
    substitution      syntax            time/date

Help topic: 

gnuplot>help set size 

gnuplot> show all

gnuplot> test

gnuplot> show palette colornames
        List of known color names:
  white              #ffffff = 255 255 255
  black              #000000 =   0   0   0
  gray0              #000000 =   0   0   0
  gray10             #1a1a1a =  26  26  26
  grey20             #333333 =  51  51  51
  grey30             #4d4d4d =  77  77  77
  gray40             #666666 = 102 102 102
  gray50             #7f7f7f = 127 127 127
  gray60             #999999 = 153 153 153
  grey70             #b3b3b3 = 179 179 179
  grey80             #cccccc = 204 204 204
  gray90             #e5e5e5 = 229 229 229
  grey100            #ffffff = 255 255 255
  grey               #bebebe = 190 190 190
  light-grey         #d3d3d3 = 211 211 211
  dark-grey          #a9a9a9 = 169 169 169
  red                #ff0000 = 255   0   0
  light-red          #f03232 = 240  50  50
  dark-red           #8b0000 = 139   0   0
  yellow             #ffff00 = 255 255   0
  light-yellow       #ffffe0 = 255 255 224
  dark-yellow        #c8c800 = 200 200   0
  green              #00ff00 =   0 255   0
  light-green        #90ee90 = 144 238 144
  dark-green         #006400 =   0 100   0
  spring-green       #00ff7f =   0 255 127
  forest-green       #228b22 =  34 139  34
  sea-green          #2e8b57 =  46 139  87
  blue               #0000ff =   0   0 255
  light-blue         #add8e6 = 173 216 230
  dark-blue          #00008b =   0   0 139
  midnight-blue      #191970 =  25  25 112
  navy               #000080 =   0   0 128
  medium-blue        #0000cd =   0   0 205
  royalblue          #4169e1 =  65 105 225
  skyblue            #87ceeb = 135 206 235
  cyan               #00ffff =   0 255 255
  light-cyan         #e0ffff = 224 255 255
  dark-cyan          #008b8b =   0 139 139
  magenta            #ff00ff = 255   0 255
  light-magenta      #f055f0 = 240  85 240
  dark-magenta       #8b008b = 139   0 139
  turquoise          #40e0d0 =  64 224 208
  light-turquoise    #afeeee = 175 238 238
  dark-turquoise     #00ced1 =   0 206 209
  pink               #ffc0cb = 255 192 203
  light-pink         #ffb6c1 = 255 182 193
  dark-pink          #ff1493 = 255  20 147
  coral              #ff7f50 = 255 127  80
  light-coral        #f08080 = 240 128 128
  orange-red         #ff4500 = 255  69   0
  salmon             #fa8072 = 250 128 114
  light-salmon       #ffa07a = 255 160 122
  dark-salmon        #e9967a = 233 150 122
  aquamarine         #7fffd4 = 127 255 212
  khaki              #f0e68c = 240 230 140
  dark-khaki         #bdb76b = 189 183 107
  gold               #ffd700 = 255 215   0
  goldenrod          #daa520 = 218 165  32
  light-goldenrod    #eedd82 = 238 221 130
  dark-goldenrod     #b8860b = 184 134  11
  beige              #f5f5dc = 245 245 220
  brown              #a52a2a = 165  42  42
  orange             #ffa500 = 255 165   0
  dark-orange        #ff8c00 = 255 140   0
  violet             #ee82ee = 238 130 238
  dark-violet        #9400d3 = 148   0 211
  plum               #dda0dd = 221 160 221
  purple             #a020f0 = 160  32 240