This command will reorder a MO according to a designated permutation vector.  The permutation vector can be any integer vector nnodes or nelements long with min value = 1, max value = nnodes/nelements and no repeated entries.   sort_key is the permutation vector - i.e. an integer node/element based mesh object attribute.

Reorder command will decide to reorder nodes or elements based on the length of the permutaion vector. When elements are reordered all element attributes are also reordered. itet and jtet arrays are also updated. When nodes are reordered, all node based attributes are also reordered. Arrays such as isn are also updated.

reorder/ -def- /sort_key/