bash 如何检查bash读取中没有输入？

How to check for no input in bash read?

提问by qliq

I am looking for a conditional to avoid users from leaving an input value blank. Any suggestions?

我正在寻找一个条件来避免用户将输入值留空。有什么建议？

Thanks

谢谢

采纳答案by Manny D

No inputs (or even spaces I believe) get entered as empty strings, so check input while the input var is empty:

没有输入（甚至我相信的空格）作为空字符串输入，因此在输入变量为空时检查输入：

input=
while [[ $input = "" ]]; do
   read input
done

回答by Mark L

unset input
while [ -z ${input} ]; do
     read input
done