General Form:

gnuplot file plotargs

Like plot, but using gnuplot for graphics output and further data manipulation. ngspice creates a file called file.plt containing the gnuplot command sequence, a file called file.data containing the data to be plotted, and a file called either file.eps (Postscript, this is the default) or file.png (the compressed binary png format, when the variable gnuplot_terminal is set to png). It is possible to suppress the latter hardcopy file by using a file name that starts with 'np_'. On Linux gnuplot is called via xterm, and offers a Gnuplot console to manipulate the data. On Windows a plot window is opened and the command console window is available with a mouse click. Of course you have to have gnuplot installed on your system.