while是用在循环执行某程序
格式1：
while 条件;
do
语句
done
格式2：
while true/:/[1]/[0]
do
示范1：
COUNTER=0
while [ $COUNTER -lt 10 ]; do
echo The counter is $COUNTER
let COUNTER=COUNTER+1
done
结果1：
The counter is 0
The counter is 1
The counter is 2
The counter is 3
The counter is 4
The counter is 5
The counter is 6
The counter is 7
The counter is 8
The counter is 9
示范2：
while true
do
date
sleep 3
done
结果2：
Mon Apr 29 23:51:08 CST 2013
Mon Apr 29 23:51:11 CST 2013
Mon Apr 29 23:51:14 CST 2013
Mon Apr 29 23:51:17 CST 2013
Mon Apr 29 23:51:20 CST 2013
Mon Apr 29 23:51:23 CST 2013
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