-----------------------------------------------------

to change a web link to fully resolve an 
address to include the domain:

-----------------------------------------------------
>--> grep "engr_ref" *.html                                           

CADSYS-index.html:<a href="http://cadsys/engr_ref/engrg_reference.html" target="main">
CADSYS.html:<a href="http://cadsys/engr_ref/engrg_reference.html" target="main">
index.html:<a href="http://cadsys/engr_ref/engrg_reference.html" target="main">

 -----------------------------------------------------

>--> perl -pi -e 's$cadsys/engr_ref$cadsys.domainnamehere.com/engr_ref$g' *.html

 -----------------------------------------------------
>--> grep "engr_ref" *.html                                           

CADSYS-index.html:<a href="http://cadsys.domainnamehere.com/engr_ref/engrg_reference.html" target="main">
CADSYS.html:<a href="http://cadsys.domainnamehere.com/engr_ref/engrg_reference.html" target="main">
index.html:<a href="http://cadsys.domainnamehere.com/engr_ref/engrg_reference.html" target="main">