teem	/	unrrdu	unu permute

unu permute: Permute scan-line ordering of axes. The permutation gives the
new ordering of the old axes (in 0-based numbering). For example, the
permutation 0->1, 1->2, 2->0 would be "2 0 1".

Usage: unu permute -p <ax0 ax1 ...> [-i <nin>] [-o <nout>]

-p <ax0 ax1 ...> = new axis ordering (1 or more ints)
        -i <nin> = input nrrd
       -o <nout> = output nrrd (string); default: "-"