[Gmsh] CAN GMsh export line information?

[Chijie Zhuang]

Dear all,
Sorry to trouble you. 
In .msh file, gmsh does not export all line informations.  It only exports some of the lines in the section of $Elements.

There are different types of elements, nodes, lines, cells... for example, each triangle contains three lines, each line contains some nodes. When coding discontinuous Galerkin method, it is better to get all the line information. 
If so, once one knows a cell index, he can easily get the lines the cell have, and next step, he can also get the node index.

So I wonder if gmsh itself can export all the line informations directly?
Thank you all.

Chijie Zhuang
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