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= Rake Command Line Usage
Rake is invoked from the command line using:
% rake [options ...] [VAR=VALUE ...] [targets ...]
Options are:
[<tt><em>name</em>=<em>value</em></tt>]
Set the environment variable <em>name</em> to <em>value</em>
during the execution of the <b>rake</b> command. You can access
the value by using ENV['<em>name</em>'].
[<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
stardard output. If _output_ is <tt>stderr</tt>, or if it is
missing, then the backtrace output is sent to standard error.
[<tt>--classic-namespace</tt> (-n)]
Import the Task, FileTask, and FileCreateTask into the top-level
scope to be compatible with older versions of Rake. Alternatively
you can include the line <code>require
'rake/classic_namespace'</code> in your Rakefile to get the
classic behavior.
[<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 number of active concurrent tasks used. The
suggested value is equal to the number of CPUs. The concurrent
tasks 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) : unlimited concurrent tasks (standard rake behavior)
-j : 2 concurrent tasks (exact number may change)
-j 16 : 16 concurrent tasks
[<tt>--job-stats</tt> _level_]
Display job statistics at the completion of the run. By default,
this will display the requested number of active tasks (from the
-j options) and the maximum number of tasks 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>--reduce-compat</tt>]
Remove the DSL commands from the Object inheritance hierarchy and
do not define top level constants. This reduces the backwards
compatibility of Rake, but allows rake to be used with software
that would otherwise have conflicting definitions.
*NOTE:* The next major version of Rake will only be able to be run
in "reduce-compat" mode.
[<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> <em>pattern</em> (-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 stardard 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> <em>pattern</em> (-W)]
Display tasks that match <em>pattern</em> 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> (-W)]
Do not display the deprecation warnings.
In addition, any command line option of the form
<em>VAR</em>=<em>VALUE</em> will be added to the environment hash
<tt>ENV</tt> and may be tested in the Rakefile.
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