Andrew's git / gitweb.git / t/t4013/diff.diff-tree_--pretty_--stat_--summary_initial
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t / t4013 / diff.diff-tree_--pretty_--stat_--summary_initialon commit sha1_file: link() returns -1 on failure, not errno (e32c0a9)
   1$ git diff-tree --pretty --stat --summary initial
   2$