Can be this?
perl -e 'for(@ARGV){open FILE,$_;chomp($a[$.-1].=$_)while<FILE>;close +FILE}$,=$/;open FILE,">out";print FILE@a' A B C

In reply to Re: parallel reading by smokemachine
in thread parallel reading by azaria

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post; it's "PerlMonks-approved HTML":