t / t4013 / diff.diff-tree_--root_-r_--abbrev=4_initialon commit t4008: modernise style (db7b9e3)
   1$ git diff-tree --root -r --abbrev=4 initial
   2444ac553ac7612cc88969031b02b3767fb8a353a
   3:000000 100644 0000... 35d2... A        dir/sub
   4:000000 100644 0000... 01e7... A        file0
   5:000000 100644 0000... 01e7... A        file2
   6$