If we write all the gnuplot commands in a file (say, filename.plt),
we can use the command load "filename.plt" at the gnuplot command
prompt and obtain the same effect.
Here is the file for plotting sin(x);
note that gnuplot identifies comments by the use of the # symbol. In data files
too, we can use # to write information about data for a human reader; gnuplot would disregard these lines while plotting.
# This is a comment! Plotting sin(x) with gnuplot
plot sin(x)
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