reverse LIST
               In list context, returns a list value consisting of the ele-
               ments of LIST in the opposite order.  In scalar context, con-
               catenates the elements of LIST and returns a string value with
               all characters in the opposite order.
 
                   print reverse <>;           # line tac, last line first
 
                   undef $/;                   # for efficiency of <>
                   print scalar reverse <>;    # character tac, last line tsrif
 


##</code><code>##

perl -e 'print scalar reverse "dog" . "\n";' 

##</code><code>##

god

##</code><code>##

perl -e 'print join( ",", reverse ( split "", "dog")) . "\n";'

##</code><code>##

g,o,d