while和until

• while是符合条件就打印,直到不符合条件退出.

#!/bin/bash

count=1

while [ $count -le 5 ]
do
 echo $count
 count=$((count + 1))
done

• until是不符合条件就打印,符合条件就退出

#!/bin/bash

count=1

until [ $count -ge 5 ]
do
 echo $count
 count=$((count + 1))
done