How to pass command line argument to gnuplot?

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You can input variables via switch -e

$ gnuplot -e "filename="foo.data"" foo.plg

In foo.plg you can then use that variable

$ cat foo.plg 
plot filename
pause -1

To make “foo.plg” a bit more generic, use a conditional:

if (!exists("filename")) filename="default.dat"
plot filename
pause -1

Note that -e has to precede the filename otherwise the file runs before the -e statements. In particular, running a shebang gnuplot #!/usr/bin/env gnuplot with ./foo.plg -e ... CLI arguments will ignore use the arguments provided.

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