r3gradient_test stdout

WARNING: block size too small, set to 3
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Writing gradient 3D raster maps...
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WARNING: block size too small, set to 3
0..50..100
Writing gradient 3D raster maps...
0..33..66..100



Description:
 Computes gradient of a 3D raster map and outputs gradient components as three 3D raster maps.

Keywords:
 raster3d, gradient, voxel

Usage:
 r3.gradient input=name
   output=grad_x,grad_y,grad_z[,grad_x,grad_y,grad_z,...]
   [blocksize=size_x,size_y,size_z[,size_x,size_y,size_z,...]] [--overwrite]
   [--help] [--verbose] [--quiet] [--ui]

Flags:
 --o   Allow output files to overwrite existing files
 --h   Print usage summary
 --v   Verbose module output
 --q   Quiet module output
 --ui  Force launching GUI dialog

Parameters:
      input   Name of input 3D raster map
     output   Name for output 3D raster map(s)
  blocksize   Size of blocks
              default: 30,30,20

ERROR: Option <output> must be provided in multiples of 3
	You provided 2 item(s): test_grad_x,test_grad_y


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Writing gradient 3D raster maps...
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