jam version (return code: 0)
Jamfile: No such file or directory
...found 2 target(s)...
jam -h (return code: 1)
Invalid option: -h
usage: jam [ options ] targets...
-a Build all targets, even if they are current.
-dx Display (a)actions (c)causes (d)dependencies
(m)make tree (x)commands (0-9) debug levels.
-fx Read x instead of Jambase.
-g Build from newest sources first.
-jx Run up to x shell commands concurrently.
-n Don't actually execute the updating actions.
-ox Write the updating actions to file x.
-q Quit quickly as soon as a target fails.
-sx=y Set variable x=y, overriding environment.
-tx Rebuild x, even if it is up-to-date.
-v Print the version of jam and exit.