#!/bin/bash
# desc : while loop
while [ "$yn" != "yes" -a "$yn" != "YES" ]
do
read -p "Please input yes/YES to stop : " yn
done
echo "OK"执行结果：[work@www sh]$ sh while.sh Please input yes/YES to stop : no Please input yes/YES to stop : yes OK [work@www sh]$例：从1加到100
#!/bin/bash
# desc : while loop
sum=0
i=0
while [ $i -lt 100 ]
do
i=$(($i+1));
sum=$(($sum+$i))
done
echo "From 1 to 100, sum is : " $sum
#!/bin/bash
# desc : while loop
until [ "$yn" == "yes" -o "$yn" == "YES" ]
do
read -p "Please input yes/YES to stop : " yn
done
echo "OK"
执行：[work@www sh]$ sh while.sh Please input yes/YES to stop : hi Please input yes/YES to stop : yes OK [work@www sh]$
#!/bin/bash
# desc : for loop
for animal in dog cat pig
do
echo "HI, ${animal}"
done执行：[work@www sh]$ sh for.sh HI, dog HI, cat HI, pig [work@www sh]$例：当前目录文件
#!/bin/bash
# desc : for loop
filelist=$(ls)
for filename in $filelist
do
echo $filename
done#!/bin/bash
# desc : for loop
sum=0
for (( i=0; i<=100; i++ ))
do
sum=$(($sum+$i))
done
echo "sum is : " $sum原文地址：http://blog.csdn.net/yonggang7/article/details/40679701
