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<!--
=head2 The C<Command> method
The C<Command> method is called as follows:
Command $env <target>, <inputs>, <build action>;
The target is made dependent upon the list of input files specified, and the
inputs must be built successfully or Cons will not attempt to build the
target.
To specify a command with multiple targets, you can specify a reference to a
list of targets. In Perl, a list reference can be created by enclosing a
list in square brackets. Hence the following command:
Command $env ['foo.h', 'foo.c'], 'foo.template', q(
gen %1
);
could be used in a case where the command C<gen> creates two files, both
F<foo.h> and F<foo.c>.
-->
<para>
Creating a &Builder; and attaching it to a &consenv;
allows for a lot of flexibility when you
want to re-use actions
to build multiple files of the same type.
This can, however, be cumbersome
if you only need to execute one specific command
to build a single file (or group of files).
For these situations, &SCons; supports a
&Command; &Builder; that arranges
for a specific action to be executed
to build a specific file or files.
This looks a lot like the other builders
(like &b-link-Program;, &b-link-Object;, etc.),
but takes as an additional argument
the command to be executed to build the file:
</para>
<programlisting>
env = Environment()
env.Command('foo.out', 'foo.in', "sed 's/x/y/' < $SOURCE > $TARGET")
</programlisting>
<para>
When executed,
&SCons; runs the specified command,
substituting &cv-link-SOURCE; and &cv-link-TARGET;
as expected:
</para>
<screen>
% <userinput>scons -Q</userinput>
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