~/mw/extensions/_tmp_$ od -cx test.php
0000000   <   ?   p   h   p  \n   t   e   s   t  \n   ?   >  \n  \n  \0
        3f3c 6870 0a70 6574 7473 3f0a 0a3e 000a
0000017
~/mw/extensions/_tmp_$ find . -name '*.php'  | xargs perl -pi -e 's/\s+$/\n/'
~/mw/extensions/_tmp_$ od -cx test.php
0000000   <   ?   p   h   p  \n   t   e   s   t  \n   ?   >  \n  \n  \0
        3f3c 6870 0a70 6574 7473 3f0a 0a3e 000a
0000017
~/mw/extensions/_tmp_$