add some gnuplot commands

scratchpad/plotting/gnuplot/command-png.gp

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+reset
+n=100 #number of intervals
+max=3. #max value
+min=-3. #min value
+width=(max-min)/n #interval width
+#function used to map a value to the intervals
+hist(x,width)=width*floor(x/width)+width/2.0
+set term png #output terminal and file
+set output "histogram.png"
+set xrange [min:max]
+set yrange [0:]
+#to put an empty boundary around the
+#data inside an autoscaled graph.
+set offset graph 0.05,0.05,0.05,0.0
+set xtics min,(max-min)/5,max
+set boxwidth width*0.9
+set style fill solid 0.5 #fillstyle
+set tics out nomirror
+set xlabel "x"
+set ylabel "Frequency"
+#count and plot
+plot "data.dat" u (hist($1,width)):(1.0) smooth freq w boxes lc rgb"green" notitle

scratchpad/plotting/gnuplot/command-terminal.gp

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+reset
+set terminal dumb size 80, 25
+n=100 #number of intervals
+width=(max-min)/n #interval width
+#function used to map a value to the intervals
+hist(x,width)=width*floor(x/width)+width/2.0
+set xrange [min:max]
+set yrange [0:]
+#to put an empty boundary around the
+#data inside an autoscaled graph.
+set offset graph 0.05,0.05,0.05,0.0
+set xtics min,(max-min)/5,max
+set boxwidth width*0.9
+set style fill solid 0.5 #fillstyle
+set tics out nomirror
+set xlabel "x"
+set ylabel "Frequency"
+#count and plot
+plot "data.dat" u (hist($1,width)):(1.0) smooth freq w boxes lc rgb"green" notitle