Usefull commands for plot charts with Gnuplot

Set label to axes

set <xlabel|ylabel> '<label_text>'
Ex.
set xlabel 'x label name'

Set tics into axes

set <xtics|ytics> <start> <incr> {<end>}
Ex.
set xtics 10, 0.5, 12      # 10, 10.5, 11, 11.5, 12

For long gnuplot scripts is useful to divide the script in more than one file. To include in a gnuplot script external files the following command can be used:

load "filename"

set boxwidth 0.5
set style fill solid
plot "data.dat" using 1:2 with boxes