Geometry options:

-0
     Output unrolled geometry, then exit

-tol float
     Set geometrical tolerance

Mesh options:

-1, -2, -3
     Perform 1D, 2D or 3D mesh generation, then exit

-saveall
     Save all elements (discard physical group definitions)

-o file
     Specify mesh output file name

-format string
     Set output mesh format (msh, unv, vrml, stl, mesh, bdf, p3d, cgns, med)

-bin
     Use binary format when available

-algo string
     Select mesh algorithm (iso, netgen, tetgen)

-smooth int
     Set number of mesh smoothing steps

-optimize
     Optimize quality of tetrahedral elements

-order int
     Set the order of the generated elements (1, 2)

-clscale float
     Set characteristic length scaling factor

-clcurv
     Compute characteristic lengths from curvatures

-rand float
     Set random perturbation factor

-bgm file
     Load background mesh from file

-constrain
     Constrain background mesh with characteristic lengths

Post-processing options:

-noview
     Hide all views on startup

-link int
     Select link mode between views (0, 1, 2, 3, 4)

-smoothview
     Smooth views

-combine
     Combine views having identical names into multi-time-step views

Display options:

-nodb
     Disable double buffering

-fontsize int
     Specify the font size for the GUI

-theme string
     Specify FLTK GUI theme

-display string
     Specify display

Other options:

-
     Parse input files, then exit

-a, -g, -m, -s, -p
     Start in automatic, geometry, mesh, solver or post-processing mode

-pid
     Print pid on stdout

-listen
     Always listen to incoming connection requests.

-v int
     Set verbosity level

-nopopup
     Don't popup dialog windows in scripts

-string "string"
     Parse option string at startup

-option file
     Parse option file at startup

-convert files
     Convert files into latest binary formats, then exit

-version
     Show version number

-info
     Show detailed version information

-help
     Show this message