Makefiles

The make utility automatically determines which pieces of a large program need to be recompiled, and issues commands to recompile them.
GNU `make'

Macro Description
$@	Current target's full name, including path, base name, and file name extension, as currently specified.
$$@	Current target's full name, including path, base name, and file name extension, as currently specified. Valid only as a dependent in a dependency.
$*	Current target's path and base name without a file name extension.
$**	All dependents of the current target.
$?	All dependents with a later time stamp than the current target.
$<	Dependent file with a later time stamp than the current target. Valid only in commands in inference rules.

$@ - Your target
$^ - All of your dependencies
$< - Your first dependency
$? - All dependencies newer than the target
$* - The stem of an implicit rule match (a.c -> a)
 echo $$bash_variable

hoelz.ro - Makefile Tips and Tricks

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