Novice advice Ip5=1 $ip5 -lt While [255] Do .. Done Why show how wrong Ip5 : Parameter not set. Novice advice Try something ${ip5} -lt While [255] Novice advice Or not, and I think for a couple of days, Gloomy Novice advice While a counter cycle required Novice advice ？ Ip5=`expr $ip5 + 1` Do you mean this? Novice advice What you shell? Novice advice Cshell Novice advice [ Closed window ]