Write a CGI program that displays a count of how many times a browser on each computer has contacted the server.
echo Content -type: text /html
echo
N=$QUERY_STRING
Echo "< HTML >"
Case "x$N" in
x) N = 1
Echo "This is the initial page.< BR >< BR >"
; ;
X[0-9]*) N = 'expr$n + 1'
Echo "you have displayed this page $N times.< BR >< BR >
; ;
*) echo "The URL you used is inval id < /HTML >"
exi t 0
; ;
esac
echo "< A HREF=\ht tp: / /$SERVER_NAME$SCRIPT_NAME?$N\ >"
echo " Click here to refresh the page. < / A>