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copied!<p>I've found the answer from these two websites: <a href="http://nhw.pl/wp/2008/10/11/rake-and-arguments-for-tasks" rel="noreferrer">Net Maniac</a> and <a href="http://www.aimred.com/news/developers/2008/10/16/arguments-for-rake/" rel="noreferrer">Aimred</a>.</p> <p>You need to have version > 0.8 of rake to use this technique</p> <p>The normal rake task description is this:</p> <pre><code>desc 'Task Description' task :task_name => [:depends_on_taskA, :depends_on_taskB] do #interesting things end </code></pre> <p>To pass arguments, do three things:</p> <ol> <li>Add the argument names after the task name, separated by commas.</li> <li>Put the dependencies at the end using :needs => [...]</li> <li>Place |t, args| after the do. (t is the object for this task)</li> </ol> <p>To access the arguments in the script, use args.arg_name</p> <pre><code>desc 'Takes arguments task' task :task_name, :display_value, :display_times, :needs => [:depends_on_taskA, :depends_on_taskB] do |t, args| args.display_times.to_i.times do puts args.display_value end end </code></pre> <p>To call this task from the command line, pass it the arguments in []s</p> <pre><code>rake task_name['Hello',4] </code></pre> <p>will output</p> <pre><code>Hello Hello Hello Hello </code></pre> <p>and if you want to call this task from another task, and pass it arguments, use invoke</p> <pre><code>task :caller do puts 'In Caller' Rake::Task[:task_name].invoke('hi',2) end </code></pre> <p>then the command</p> <pre><code>rake caller </code></pre> <p>will output</p> <pre><code>In Caller hi hi </code></pre> <p>I haven't found a way to pass arguments as part of a dependency, as the following code breaks:</p> <pre><code>task :caller => :task_name['hi',2]' do puts 'In Caller' end </code></pre>

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