for循环输出1-10的四种方法

1.for循环输出1-10的四种方法

#!/bin/bash
for ((i=1;i<=10;i++))
do
     echo $i
done

#!/bin/bash
i=1
for ((;i<=10;i++))
do
    echo $i
done

#!/bin/bash 
i=1
for ((;i<=10;))
do
    echo $i
    let i++
done

#!/bin/bash 
i=1
for ((;;))
do 
    if [ $i -le 10 ]
    then
          echo $i
          let i++
   else 
         exit 0
   fi
done   

2.奇数偶数求和