$ conan graph build-order-merge -h
WARN: Downgrading cache from Conan 2.2.3 to 2.0.17
usage: conan graph build-order-merge [-h] [-f FORMAT] [-v [V]] [--file [FILE]]
Merge more than 1 build-order file.
options:
-h, --help show this help message and exit
-f FORMAT, --format FORMAT
Select the output format: json
-v [V] Level of detail of the output. Valid options from less
verbose to more verbose: -vquiet, -verror, -vwarning,
-vnotice, -vstatus, -v or -vverbose, -vv or -vdebug,
-vvv or -vtrace
--file [FILE] Files to be merged