UNIX for Advanced & Expert Users

TRIES=0

while ! wget --tries=1 http://url/
do
        # Break the loop early if this is the first try and XXXX isn't found in logfile
        [ "$TRIES" -eq 0 ] && ! grep -q "XXXXXXXX" /path/to/logfile && break
        TRIES=`expr $TRIES + 1`
done

TRIES=1

while ! wget --tries=1 http://url/
do
        case "$TRIES" in
        1)     # First failure.
                # if xxxx is in logfile, try again.
                grep -q xxxxx /path/to/logfile || break
                ;;
         *)   # Second and further failures.  Break the loop.
                break
                ;;
        esac

        TRIES=`expr $TRIES + 1`
done