linux for 命令常用的读写方法

1、标准方式：

　　for var in list

　　do

　　　　commands

　　done

 

2、一行书写方式：

　　for var in list; do

 

3、读取列表中的值

　　for test in Nevada New Hampshire New Mexico New York North Carolina

　　do

　　　　echo "Now going to $test"

　　done

 

4、从变量读取列表

list="Alabama Alaska Arizona Arkansas Colorado"

list=$list" Connecticut"　

for state in $list

do

　　echo "Have you ever visited $state?"

done

$ ./test4

Have you ever visited Alabama?

Have you ever visited Alaska?

 

5、从命令读取值

file="states"

for state in $(cat $file)

do

　　echo "Visit beautiful $state"

done

$ cat states

Alabama

Alaska

Arizona

$ ./test5

Visit beautiful Alabama

Visit beautiful Alaska

Visit beautiful Arizona

 

6、在bash shell C 语言的 for 命令

for (( i=1; i <= 10; i++ ))

do

　　echo "The next number is $i"

done

The next number is 1

The next number is 2

The next number is 3

7、bash shell C 语言的 for 命令，使用多个变量

for (( a=1, b=10; a <= 10; a++, b-- ))

do

　　echo "$a - $b"

done

1 - 10

2 - 9

3 - 8