shellScript之util语句

本文主要是介绍shellScript之util语句，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

#!/bin/bash
i=0
until [[ "$i" -gt 5 ]]
dolet "square=i*i"echo "$i * $i = $square"let "i++"
done

结果：

~/Note/test # ./15until.sh 
0 * 0 = 0
1 * 1 = 1
2 * 2 = 4
3 * 3 = 9
4 * 4 = 16
5 * 5 = 25

例子2：

#!/bin/bash
echo "Please input the num(1-10):"
read num
until [[ "$num" = 4 ]]
doif [ "$num" -lt 4 ];thenecho "Too small,Try again:"read numelif [ "$num" -gt 4 ];thenecho "To high,Try again:"read numelseexit 12fi
done
echo "congralutional,you got it."       

结果：

~/Note/test # ./16until.sh 
Please input the num(1-10):
5
To high,Try again:
3
Too small,Try again:
4
congralutional,you got it.

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