root-merge command

root-merge merges ROOT files' content into a merged ROOT file.

Usage: root-merge [options] file1.root [file2.root [file3.root [...]]]

ex:

$> root-merge -o out.root ./testdata/chain.flat.1.root ./testdata/chain.flat.2.root

options:

-o string
  	path to merged output ROOT file (default "out.root")
-v	enable verbose mode