relationship to upstream branch (if any). If given twice, print
the name of the upstream branch, as well.
+-q::
+--quiet::
+ Be more quiet when creating or deleting a branch, suppressing
+ non-error messages.
+
--abbrev=<length>::
Alter the sha1's minimum display length in the output listing.
The default value is 7 and can be overridden by the `core.abbrev`