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= Rake Command Line Usage

Rake is invoked from the command line using:

% rake [options ...]  [VAR=VALUE ...]  [targets ...]

Options are:

[<tt>name=value</tt>]
 Set the environment variable name to value
 during the execution of the rake command. You can access
 the value by using ENV['name'].

[<tt>--all</tt> (-A)]
 Used in combination with the -T and -D options, will force
 those options to show all the tasks, even the ones without comments.

[<tt>--backtrace</tt>{=_output_} (-n)]
 Enable a full backtrace (i.e. like --trace, but without the task
 tracing details). The _output_ parameter is optional, but if
 specified it controls where the backtrace output is sent. If
 _output_ is <tt>stdout</tt>, then backtrace output is directed to
 standard output. If _output_ is <tt>stderr</tt>, or if it is
 missing, then the backtrace output is sent to standard error.

[<tt>--comments</tt>]
 Used in combination with the -W options to force the output to
 contain commented options only. This is the reverse of
 <tt>--all</tt>.

[<tt>--describe</tt> _pattern_ (-D)]
 Describe the tasks (matching optional PATTERN), then exit.

[<tt>--dry-run</tt> (-n)]
 Do a dry run. Print the tasks invoked and executed, but do not
 actually execute any of the actions.

[<tt>--execute</tt> _code_ (-e)]
 Execute some Ruby code and exit.

[<tt>--execute-print</tt> _code_ (-p)]
 Execute some Ruby code, print the result, and exit.

[<tt>--execute-continue</tt> _code_ (-E)]
 Execute some Ruby code, then continue with normal task processing.

[<tt>--help</tt> (-H)]
 Display some help text and exit.

[<tt>--jobs</tt> _number_ (-j)]

Specifies the maximum number of concurrent threads allowed. Rake
    will allocate threads as needed up to this maximum number.

If omitted, Rake will attempt to estimate the number of CPUs on
    the system and add 4 to that number.

The concurrent threads are used to execute the <tt>multitask</tt>
 prerequisites. Also see the <tt>-m</tt> option which turns all
 tasks into multitasks.

Sample values:
       (no -j)   : Allow up to (# of CPUs + 4) number of threads
       --jobs    : Allow unlimited number of threads
       --jobs=1  : Allow only one thread (the main thread)
       --jobs=16 : Allow up to 16 concurrent threads

[<tt>--job-stats</tt> _level_]

Display job statistics at the completion of the run. By default,
    this will display the requested number of active threads (from the
    -j options) and the maximum number of threads in play at any given
    time.

If the optional _level_ is <tt>history</tt>, then a complete trace
 of task history will be displayed on standard output.

[<tt>--libdir</tt> _directory_ (-I)]
 Add _directory_ to the list of directories searched for require.

[<tt>--multitask</tt> (-m)]
 Treat all tasks as multitasks. ('make/drake' semantics)

[<tt>--nosearch</tt> (-N)]
 Do not search for a Rakefile in parent directories.

[<tt>--prereqs</tt> (-P)]
 Display a list of all tasks and their immediate prerequisites.

[<tt>--quiet</tt> (-q)]
 Do not echo commands from FileUtils.

[<tt>--rakefile</tt> _filename_ (-f)]
 Use _filename_ as the name of the rakefile. The default rakefile
 names are +rakefile+ and +Rakefile+ (with +rakefile+ taking
 precedence). If the rakefile is not found in the current
 directory, +rake+ will search parent directories for a match. The
 directory where the Rakefile is found will become the current
 directory for the actions executed in the Rakefile.

[<tt>--rakelibdir</tt> _rakelibdir_ (-R)]
 Auto-import any .rake files in RAKELIBDIR. (default is 'rakelib')

[<tt>--require</tt> _name_ (-r)]
 Require _name_ before executing the Rakefile.

[<tt>--rules</tt>]
 Trace the rules resolution.

[<tt>--silent (-s)</tt>]
 Like --quiet, but also suppresses the 'in directory' announcement.

[<tt>--suppress-backtrace _pattern_ </tt>]
 Line matching the regular expression _pattern_ will be removed
 from the backtrace output. Note that the --backtrace option is the
 full backtrace without these lines suppressed.

[<tt>--system</tt> (-g)]
 Use the system wide (global) rakefiles. The project Rakefile is
 ignored. By default, the system wide rakefiles are used only if no
 project Rakefile is found. On Unix-like system, the system wide
 rake files are located in $HOME/.rake. On a windows system they
 are stored in $APPDATA/Rake.

[<tt>--no-system</tt> (-G)]
 Use the project level Rakefile, ignoring the system-wide (global)
 rakefiles.

[<tt>--tasks</tt> pattern (-T)]
 Display a list of the major tasks and their comments. Comments
 are defined using the "desc" command. If a pattern is given, then
 only tasks matching the pattern are displayed.

[<tt>--trace</tt>{=_output_} (-t)]
 Turn on invoke/execute tracing. Also enable full backtrace on
 errors. The _output_ parameter is optional, but if specified it
 controls where the trace output is sent. If _output_ is
 <tt>stdout</tt>, then trace output is directed to standard output.
 If _output_ is <tt>stderr</tt>, or if it is missing, then trace
 output is sent to standard error.

[<tt>--verbose</tt> (-v)]
 Echo the Sys commands to standard output.

[<tt>--version</tt> (-V)]
 Display the program version and exit.

[<tt>--where</tt> pattern (-W)]
 Display tasks that match pattern and the file and line
 number where the task is defined. By default this option will
 display all tasks, not just the tasks that have descriptions.

[<tt>--no-deprecation-warnings</tt> (-X)]
 Do not display the deprecation warnings.

In addition, any command line option of the form
VAR=VALUE will be added to the environment hash
<tt>ENV</tt> and may be tested in the Rakefile.

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