步进循环语句for

一、for语句的基本格式

for 变量 in 列表

do 

    语句块

done

二、使用for语句处理列表（数组）

[root@localhost shell]# cat use_for_deal_with_list.sh

#!/bin/bash



#Use for loop deal with list.

#2013.12.20



I=1

for LOOP in 1 2 3 4 5 6 

 do

        echo "loop:"$I

        echo "LOOP="$LOOP

        I=`expr $I + 1`

done

exit 0

[root@localhost shell]# cat use_for_deal_with_array.sh

#!/bin/bash



#Use for loop deal with array.

#2013.12.20



I=1

ARR=(1 2 3 4 5 6)

for LOOP in ${ARR[*]}

 do

        echo "loop:"$I

        echo "LOOP="$LOOP

        I=`expr $I + 1`

done

exit 0