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gfsview:

graphical viewer for Gerris simulation files: version 20121130

gfsview [OPTIONS] FILE1 FILE2 ...

Opens Gerris and/or GfsView files using the appropriate (2D or 3D) version of GfsView. All the files must have the same dimension (2D or 3D).

[......]
any valid option of GfsView
[--help]
display this message and exits