performance - How do I efficiently concatenate ImageMagick and convert commands to produce a no of images -

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i have big big size image of dimensions 4000*4000. want carry out various operations on image :

convert a.jpg -crop 6x6@ +repage +adjoin tile_6_%d.jpg convert a.jpg -crop 9x9@ +repage +adjoin tile_9_%d.jpg convert a.jpg -crop 3x3@ +repage +adjoin tile_3_%d.jpg  convert a.jpg -resize 120x120  thumbnail.jpg

thus creating batch of 36+81+9+1 = 127

i trying 

         convert a.jpg \       \( +clone -resize 66% -crop 6x6@ +repage +adjoin -write tile_6x6_%d.jpg +delete \) \       \( +clone -resize 33% -crop 3x3@ +repage +adjoin -write tile_3x3_%d.jpg +delete \) \       \( +clone -crop 9x9@ +repage +adjoin -write tile_9x9_%d.jpg +delete \) \                 -density 150 -quality 50     -resize 120x120      thumbnail.jpg

but doesn't work desired way , produces 250 files. wrong here ? best way concatenate these commands ?

+delete deletes last image in image sequence. want -delete 0--1, means delete images 0 through -1, negatively indexed -1 refers last image in sequence.

to elaborate bit, each of -crop commands creates several images, want make sure delete of them stack after writing them disk. when working complex convert command line this, way see going on image stack(s) @ point insert -write info:.


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