A list of the syntax for all gnuplot commands as extracted from the manual delivered with gnuplot-4.6.3. Grabed via Sublime Text 2 and the RegEx `\sSyntax.*:(\s{7,}.*\n){1,30}`

Gnuplot Syntax

 Syntax:

       ... {linecolor | lc} {<colorspec> | <n>}
       ... {textcolor | tc} {<colorspec> | {linetype | lt} <n>}

 Syntax:
       bind {allwindows} [<key-sequence>] ["<gnuplot commands>"]
       bind <key-sequence> ""
       reset bind

 Syntax:

     plot ... with filledcurves [option]

 Syntax:

      newhistogram {"<title>"} {lt <linetype>} {fs <fillstyle>} {at <x-coord>}

 Syntax:
       cd '<directory-name>'

 Syntax:
       call "<input-file>" <parameter-0> <parm-1> ... <parm-9>

 Syntax:
       do for <iteration-spec> {
            <commands>
            <commands>
       }

 Syntax:
       eval <string expression>

 Syntax:
       fit {<ranges>} <expression>
           '<datafile>' {datafile-modifiers}
           via '<parameter file>' | <var1>{,<var2>,...}

 Syntax:
       load "<input-file>"

 Syntax:
       lower {plot_window_nb}

 Syntax:
       pause <time> {"<string>"}
       pause mouse {<endcondition>}{, <endcondition>} {"<string>"}

 Syntax:
       plot {<ranges>}
            {<iteration>}
            {<function> | {"<datafile>" {datafile-modifiers}}}
            {axes <axes>} {<title-spec>} {with <style>}
            {, {definitions{,}} <function> ...}

 Syntax:
       plot '<file_name>' {binary <binary list>} ...
       splot '<file_name>' {binary <binary list>} ...

 Syntax:
       plot '<file_name>' {binary <binary list>}
                          {{nonuniform} matrix}
                          {index <index list> | index "<name>"}
                          {every <every list>}
                          {thru <thru expression>}
                          {using <using list>}
                          {smooth <option>}
                          {volatile} {noautoscale}

 Syntax:
       plot 'file' every {<point_incr>}
                           {:{<block_incr>}
                             {:{<start_point>}
                               {:{<start_block>}
                                 {:{<end_point>}
                                   {:<end_block>}}}}}

 Syntax:
       plot 'file' index { <m>{:<n>{:<p>}} | "<name>" }

 Syntax:
       smooth {unique | frequency | cumulative | cnormal | kdensity 
                      | csplines | acsplines | bezier | sbezier}

 Syntax:
       plot 'file' thru f(x)

 Syntax:
       plot 'file' using <entry> {:<entry> {:<entry> ...}} {'format'}

 Syntax:
       [{<dummy-var>=}{{<min>}:{<max>}}]
       [{{<min>}:{<max>}}]

 Syntax:
       plot for [<variable> = <start> : <end> {:<increment>}]
       plot for [<variable> in "string of words"]

 Syntax:
       title <text> | notitle [<ignored text>]
       title columnheader | title columnheader(N)

 Syntax:
       with <style> { {linestyle | ls <line_style>}
                      | {{linetype  | lt <line_type>}
                         {linewidth | lw <line_width>}
                         {linecolor | lc <colorspec>}
                         {pointtype | pt <point_type>}
                         {pointsize | ps <point_size>}
                         {fill | fs <fillstyle>}
                         {nohidden3d} {nocontours} {nosurface}
                         {palette}}
                    }

 Syntax:
       print <expression> {, <expression>, ...}

 Syntax:
       raise {plot_window_nb}

 Syntax:
       save  {<option>} '<filename>'

 Syntax:
       set angles {degrees | radians}
       show angles

 Syntax:
       set arrow {<tag>} {from <position>} {to|rto <position>}
                 { {arrowstyle | as <arrow_style>}
                   | { {nohead | head | backhead | heads}
                       {size <length>,<angle>{,<backangle>}}
                       {filled | empty | nofilled}
                       {front | back}
                       { {linestyle | ls <line_style>}
                         | {linetype | lt <line_type>}
                           {linewidth | lw <line_width} } } }

       unset arrow {<tag>}
       show arrow {<tag>}

 Syntax:
       set autoscale {<axes>{|min|max|fixmin|fixmax|fix} | fix | keepfix}
       unset autoscale {<axes>}
       show autoscale

 Syntax:
       set bars {small | large | fullwidth | <size>} {front | back}
       unset bars
       show bars

 Syntax:
       set border {<integer>} {front | back} {linewidth | lw <line_width>}
                  {{linestyle | ls <line_style>} | {linetype | lt <line_type>}}
       unset border
       show border

 Syntax:
       set boxwidth {<width>} {absolute|relative}
       show boxwidth

 Syntax:
       set clabel {'<format>'}
       unset clabel
       show clabel

 Syntax:
       set clip <clip-type>
       unset clip <clip-type>
       show clip

 Syntax:
       set cntrparam { { linear
                       | cubicspline
                       | bspline
                       | points <n>
                       | order <n>
                       | levels { auto {<n>} | <n>
                                  | discrete <z1> {,<z2>{,<z3>...}}
                                  | incremental <start>, <incr> {,<end>}
                                }
                       }
                     }
       show contour

 Syntax:
       set contour {base | surface | both}
       unset contour
       show contour

 Syntax:
       set datafile missing {"<string>"}
       show datafile missing
       unset datafile

 Syntax:
       set datafile separator {"<char>" | whitespace}

 Syntax:
       set datafile commentschars {"<string>"}
       show datafile commentschars
       unset commentschars

 Syntax:
       set datafile binary <binary list>
       show datafile binary
       show datafile
       unset datafile

 Syntax:
       set decimalsign {<value> | locale {"<locale>"}}
       unset decimalsign
       show decimalsign

 Syntax:
       set dgrid3d {<rows>} {,{<cols>}}
                   { splines |
                     qnorm {<norm>} |
                     (gauss | cauchy | exp | box | hann) 
                       {kdensity} {<dx>} {,<dy>} }
       unset dgrid3d
       show dgrid3d

 Syntax:
       set dummy {<dummy-var>} {,<dummy-var>}
       show dummy

 Syntax:
       set encoding {<value>}
       set encoding locale
       show encoding

 Syntax:
       set fit {logfile {"<filename>"}} {{no}errorvariables} {{no}quiet}
       unset fit
       show fit

 Syntax:
       set fontpath {"pathlist1" {"pathlist2"...}}
       show fontpath

 Syntax:
       set format {<axes>} {"<format-string>"}
       set format {<axes>} {'<format-string>'}
       show format

 Syntax:
       show functions

 Syntax:
       set grid {{no}{m}xtics} {{no}{m}ytics} {{no}{m}ztics}
                {{no}{m}x2tics} {{no}{m}y2tics}
                {{no}{m}cbtics}
                {polar {<angle>}}
                {layerdefault | front | back}
                { {linestyle <major_linestyle>}
                  | {linetype | lt <major_linetype>}
                    {linewidth | lw <major_linewidth>}
                  { , {linestyle | ls <minor_linestyle>}
                      | {linetype | lt <minor_linetype>}
                        {linewidth | lw <minor_linewidth>} } }
       unset grid
       show grid

 Syntax:
       set hidden3d {defaults} |
                    { {front|back}
                      {{offset <offset>} | {nooffset}}
                      {trianglepattern <bitpattern>}
                      {{undefined <level>} | {noundefined}}
                      {{no}altdiagonal}
                      {{no}bentover} }
       unset hidden3d
       show hidden3d

 Syntax:
       set historysize <int>
       unset historysize

 Syntax:
       set isosamples <iso_1> {,<iso_2>}
       show isosamples

 Syntax:
       set key {on|off} {default}
               {{inside | outside} | {lmargin | rmargin | tmargin | bmargin}
                 | {at <position>}}
               {left | right | center} {top | bottom | center}
               {vertical | horizontal} {Left | Right}
               {{no}opaque}
               {{no}reverse} {{no}invert}
               {samplen <sample_length>} {spacing <vertical_spacing>}
               {width <width_increment>}
               {height <height_increment>}
               {{no}autotitle {columnheader}}
               {title "<text>"} {{no}enhanced}
               {font "<face>,<size>"} {textcolor <colorspec>}
               {{no}box { {linestyle | ls <line_style>}
                          | {linetype | lt <line_type>}
                            {linewidth | lw <line_width>}}}
               {maxcols {<max no. of columns> | auto}}
               {maxrows {<max no. of rows> | auto}}
       unset key
       show key

 Syntax:
       set label {<tag>} {"<label text>"} {at <position>}
                 {left | center | right}
                 {norotate | rotate {by <degrees>}}
                 {font "<name>{,<size>}"}
                 {noenhanced}
                 {front | back}
                 {textcolor <colorspec>}
                 {point <pointstyle> | nopoint}
                 {offset <offset>}
       unset label {<tag>}
       show label

 Syntax:
       set loadpath {"pathlist1" {"pathlist2"...}}
       show loadpath

 Syntax:
       set locale {"<locale>"}

 Syntax:
       set logscale <axes> {<base>}
       unset logscale <axes>
       show logscale

 Syntax:
      set macros

 Syntax:
       set mapping {cartesian | spherical | cylindrical}

 Syntax:
       set bmargin {{at screen} <margin>}
       set lmargin {{at screen} <margin>}
       set rmargin {{at screen} <margin>}
       set tmargin {{at screen} <margin>}
       show margin

 Syntax:
       set mouse {doubleclick <ms>} {nodoubleclick} \
                 {{no}zoomcoordinates} \
                 {noruler | ruler {at x,y}} \
                 {polardistance{deg|tan} | nopolardistance} \
                 {format <string>} \
                 {clipboardformat <int>/<string>} \
                 {mouseformat <int>/<string>} \
                 {{no}labels {"labeloptions"}} \
                 {{no}zoomjump} {{no}verbose}
       unset mouse

 Syntax:
       set multiplot
           { title <page title> {font <fontspec>} {enhanced|noenhanced} }
           { layout <rows>,<cols> 
             {rowsfirst|columnsfirst} {downwards|upwards}
             {scale <xscale>{,<yscale>}} {offset <xoff>{,<yoff>}}
           }
       unset multiplot

 Syntax:
       set mxtics {<freq> | default}
       unset mxtics
       show mxtics

 Syntax:
       set offsets <left>, <right>, <top>, <bottom>
       unset offsets
       show offsets

 Syntax:
       set origin <x-origin>,<y-origin>

 Syntax:
       set output {"<filename>"}
       show output

 Syntax:
       set parametric
       unset parametric
       show parametric

 Syntax (the options can be given in any order):
       set pm3d {
                  { at <position> }
                  { interpolate <steps/points in scan, between scans> }
                  { scansautomatic | scansforward | scansbackward | depthorder }
                  { flush { begin | center | end } }
                  { ftriangles | noftriangles }
                  { clip1in | clip4in }
                  { corners2color { mean|geomean|median|min|max|c1|c2|c3|c4 } }
                  { hidden3d {<linestyle>} | nohidden3d }
                  { implicit | explicit }
                  { map }
                }
       show pm3d
       unset pm3d

 Syntax:
       set palette
       set palette {
                  { gray | color }
                  { gamma <gamma> }
                  {   rgbformulae <r>,<g>,<b>
                    | defined { ( <gray1> <color1> {, <grayN> <colorN>}... ) }
                    | file '<filename>' {datafile-modifiers}
                    | functions <R>,<G>,<B>
                  }
                  { cubehelix {start <val>} {cycles <val>} {saturation <val>} }
                  { model { RGB | HSV | CMY | YIQ | XYZ } }
                  { positive | negative }
                  { nops_allcF | ps_allcF }
                  { maxcolors <maxcolors> }
                }
       show palette
       show palette palette <n> {{float | int}}
       show palette gradient
       show palette fit2rgbformulae
       show palette rgbformulae
       show colornames

 Syntax:
       set palette  defined { ( <gray1> <color1> {, <grayN> <colorN>}... ) }

 Syntax:
       set pointsize <multiplier>
       show pointsize

 Syntax:
       set polar
       unset polar
       show polar

 Syntax:
       set print
       set print "-"
       set print "<filename>"
       set print "<filename>" append
       set print "|<shell_command>"

 Syntax:
       set samples <samples_1> {,<samples_2>}
       show samples

 Syntax:
       set size {{no}square | ratio <r> | noratio} {<xscale>,<yscale>}
       show size

 Syntax:
       set style function <style>
       set style data <style>
       show style function
       show style data

 Syntax:
       set style arrow <n> <arrowstyle>
       set style fill <fillstyle>
       set style histogram <histogram style options>
       set style line <n> <linestyle>

 Syntax:
       set style rectangle <object options> <linestyle> <fillstyle>
       set style circle radius <size>
       set style ellipse size <size> units {xy|xx|yy}

 Syntax:
       set style arrow <index> default
       set style arrow <index> {nohead | head | heads}
                               {size <length>,<angle>{,<backangle>}}
                               {filled | empty | nofilled}
                               {front | back}
                               { {linestyle | ls <line_style>}
                                 | {linetype | lt <line_type>}
                                   {linewidth | lw <line_width} }
       unset style arrow
       show style arrow

 Syntax:
       set style boxplot {range <r> | fraction <f>}
                         {{no}outliers} {pointtype <p>}
                         {candlesticks | financebars}
                         {separation <x>}
                         {labels off | auto | x | x2}
                         {sorted | unsorted}

 Syntax:
       set style data <plotting-style>
       show style data

 Syntax:
       set style fill {empty
                       | {transparent} solid {<density>}
                       | {transparent} pattern {<n>}}
                      {border {lt} {lc <colorspec>} | noborder}

 Syntax:
       set style function <plotting-style>
       show style function

 Syntax:
       set style increment {default|userstyles}
       show style increment

 Syntax:
       set style line <index> default
       set style line <index> {{linetype  | lt} <line_type> | <colorspec>}
                              {{linecolor | lc} <colorspec>}
                              {{linewidth | lw} <line_width>}
                              {{pointtype | pt} <point_type>}
                              {{pointsize | ps} <point_size>}
                              {{pointinterval | pi} <interval>}
                              {palette}
       unset style line
       show style line

 Syntax:
       set style circle {radius {graph|screen} <R>}

 Syntax:
       set style ellipse {units xx|xy|yy}
                         {size {graph|screen} <a>, {{graph|screen} <b>}}
                         {angle <angle>}

 Syntax:
       set surface
       unset surface
       show surface

 Syntax:
       set table {"outfile"}
       plot <whatever>
       unset table

 Syntax:
       set terminal {<terminal-type> | push | pop}
       show terminal

 Syntax:
       set tics {axis | border} {{no}mirror}
                {in | out} {scale {default | <major> {,<minor>}}}
                {{no}rotate {by <ang>}} {offset <offset> | nooffset}
                {left | right | center | autojustify}
                { format "formatstring" } { font "name{,<size>}" }
                { textcolor <colorspec> }
       set tics {front | back}
       unset tics
       show tics

 Syntax:
       set timestamp {"<format>"} {top|bottom} {{no}rotate}
                     {offset <xoff>{,<yoff>}} {font "<fontspec>"}
       unset timestamp
       show timestamp

 Syntax:
       set timefmt "<format string>"
       show timefmt

 Syntax:
       set title {"<title-text>"} {offset <offset>} {font "<font>{,<size>}"}
                 {{textcolor | tc} {<colorspec> | default}} {{no}enhanced}
       show title

 Syntax:
       show variables      # show variables that do not begin with GPVAL_
       show variables all  # show all variables including those beginning GPVAL_
       show variables NAME # show only variables beginning with NAME

 Syntax:
       show version {long}

 Syntax:
       set view <rot_x>{,{<rot_z>}{,{<scale>}{,<scale_z>}}}
       set view map
       set view {no}equal {xy|xyz}
       show view

 Syntax:
       set xdata {time}
       show xdata

 Syntax:
       set xdtics
       unset xdtics
       show xdtics

 Syntax:
       set xlabel {"<label>"} {offset <offset>} {font "<font>{,<size>}"}
                  {textcolor <colorspec>} {{no}enhanced}
                  {rotate by <degrees> | rotate parallel | norotate}
       show xlabel

 Syntax:
       set xmtics
       unset xmtics
       show xmtics

 Syntax:
       set xrange { [{{<min>}:{<max>}}] {{no}reverse} {{no}writeback} }
                  | restore
       show xrange

 Syntax:
       set xtics {axis | border} {{no}mirror}
                 {in | out} {scale {default | <major> {,<minor>}}}
                 {{no}rotate {by <ang>}} {offset <offset> | nooffset}
                 {left | right | center | autojustify}
                 {add}
                 {  autofreq
                  | <incr>
                  | <start>, <incr> {,<end>}
                  | ({"<label>"} <pos> {<level>} {,{"<label>"}...) }
                 { format "formatstring" } { font "name{,<size>}" }
                 { rangelimited }
                 { textcolor <colorspec> }
       unset xtics
       show xtics

 Syntax:
       set xyplane at <zvalue>
       set xyplane relative <frac>
       set ticslevel <frac>        # equivalent to set xyplane relative
       show xyplane

 Syntax:
       set zero <expression>
       show zero

 Syntax:
       set {x|x2|y|y2|z}zeroaxis { {linestyle | ls <line_style>}
                                  | { linetype | lt <line_type>}
                                    { linewidth | lw <line_width>}}
       unset {x|x2|y|y2|z}zeroaxis
       show {x|y|z}zeroaxis

 Syntax:
       splot {<ranges>}
             {<iteration>}
             <function> | "<datafile>" {datafile-modifiers}}
             {<title-spec>} {with <style>}
             {, {definitions{,}} <function> ...}

 Syntax:
       splot '<file_name>' {binary <binary list>}
                           {{nonuniform} matrix}
                           {index <index list>}
                           {every <every list>}
                           {using <using list>}

 Syntax:
      stats 'filename' [using N[:M]] [name 'prefix'] [[no]output]]

 Syntax:
       test {terminal | palette [rgb|rbg|grb|gbr|brg|bgr]}

 Syntax:
       update <filename> {<filename>}

 Syntax:
       while (<expr>) {
           <commands>
       }