#
bin/hledger -f - balance
<<<
2009/1/1 x
 aaaaaaaaaaaaaaaaaaaa:aaaaaaaaaaaaaaaaaaaa:aaaaaaaaaaaaaaaaaaaa  €1
 b
>>>
                  €1  aaaaaaaaaaaaaaaaaaaa:aaaaaaaaaaaaaaaaaaaa:aaaaaaaaaaaaaaaaaaaa
                 €-1  b
--------------------
                  €0
# One commodity. Balance should be elided
bin/hledger -f - balance
<<<
2010/04/01 tr1
  a   16$
  b   -16$

2010/04/02 tr2
  a   -16$
  b   16$
>>>
--------------------
                   0
# Two commodities. Balance should also be elided
bin/hledger -f - balance
<<<
2010/04/01 tr1
  a   16$ @@ 10€
  b   -10€

2010/04/02 tr2
  a   -16$
  b   10€ @@ 16$
>>>
--------------------
                   0