Linux Shell编程(2): for while

for (( i = ; i < ; i++))
do
        echo "current number is $i"
done

SERVICES="80   22   25   110   8000   23   20   21   3306   "

for   x   in   $SERVICES
do
        echo $x
done

for x in a b c
do
        echo $x
done

for i in $* #$*是字符串：以"参数1 参数2 ... " 形式保存所有参数
do
        echo "parameter is $i"
done

for i in *.sh
do
echo $i
done

for i in $(ls *.sh)
do
        echo $i
done

array=(a1 a2 a3)
#array=([]=a1 []=a2 []=a3)
#array[]=a1 array[]=a2 array[]=a3
echo "the length of array is ${#array[@]}"
for item in ${array[@]}
do
        echo "item in array: "$item
done

for i in /Users/scg/PycharmProjects/xiaoliang/main/*.py
do
        echo $i
done

i=
while [ $i -ge  ]
do
        echo $i
        if [ $i -eq  ]
        then break
        fi
        i=$[i-]
done