jam [ -a ] [ -g ] [ -n ] [ -q ] [ -T ] [ -v ]
    [ -b ]
    [ -C workdir ]
    [ -d debug ]
    [ -f jambase ]
    [ -j jobs ]
    [ -o actionsfile ]
    [ -s var=value ]
    [ -S ]
    [ var=value ]
    [ -t target ]
    [ target ... ]

If target is provided on the command line, jam builds target; otherwise jam builds the target 'all'.

Jam may be invoked with the following options:

`-a`	Build all targets anyway, even if they are up-to-date.
`-b`	Enables the Tilde Lua debugger and waits for a connection.
`-C workdir`	Set the Jam current working directory to workdir.
`-d c`	Turn on display option c and off the default display (summary info and actions): a Show summary info, actions, quiet actions, and the use of temporary targets c Show the names of files that cause rebuilds, i.e. new sources, missing targets, etc. d Display a dependency graph (in jam syntax). f Display fate changes. g Display a detailed hierarchical dependency graph. m Display the dependency analysis, and target/source timestamps and paths x Show shell arguments
`-d n`	Enable cumulative debugging levels from 1 to n. Interesting values are: 1 Show actions and summary info (the default) 2 Show text of actions 3 Show progress of make. Show files when bound 4 Show execcmd()'s work 5 Show rule invocations and variable expansions 6 Show directory/header file/archive scans 7 Show variable settings 8 Show variable fetches and expansions. Show 'if' calculations. 9 Show variable manipulation, scanner tokens. Show memory use.
`-d +n`	Enable debugging level n.
`-d 0`	Turn off all debugging levels. Only errors are emitted.
`-f jambase`	Read jambase instead of using the built-in Jambase. Multiple -f flags are permitted.
`-g`	Build targets with the newest sources first, rather than in the order of appearance in the Jambase/Jamfiles.
`-j n`	Run up to n shell commands concurrently. The default is the maximum number of available processors on the machine. On Windows, the number of processors is determined from the environment variable `NUMBER_OF_PROCESSORS`. On Mac OS X, the number of processors is obtained from the API `MPProcessors`.
`-n`	Don't actually execute the updating actions, but do everything else. This changes the debug level to -dax.
`-o file`	Write the updating actions to the specified file instead of running them (or outputting them, as on the Mac).
`-q`	Quit quickly (as if an interrupt was received) as soon as any target build fails.
`-s var=value`	Set the variable var to value, overriding both internal variables and variables imported from the environment.
`-S`	When specified, any rules called that have not been defined are skipped without warning. `jam –workspace` makes extensive use of it. This command line option will mask problems with your Jamfiles, so it is recommended you don't use it.
`var=value`	Set the variable var to value, overriding both internal variables and variables imported from the environment. This is a simpler to use version of `-s`
`-t target`	Rebuild target and everything that depends on it, even if it is up-to-date.
`-T`	Toggle printing of the target's bound name (full path).
`-v`	Print the version of jam and exit.