Makefile Tips and Tricks

I always have trouble remembering these.

$@ - 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)

  %.pdf : %.dvi
        dvipdf $^ $@
 
  %.dvi : %.tex
        latex $^

Use $$:

  echo $$bash_variable