你怎么能在bash上运行命令，直到成功 [英] How can you run a command in bash over until success

问题描述

我有一个剧本，要问一些信息的用户，脚本无法继续下去，直到用户在这个信息填充。以下是我在把一个命令成一个圈来实现这一尝试，但它不会出于某种原因。

 回声请更改密码
而passwd文件
做
回声重试
DONE
 

我已经试过了while循环的许多变化：

 而`passwd`
而[[`passwd`-gt 0]
而[`passwd` -ne 0]
＃ ... 以及更多
 

但我似乎无法得到它的工作。

解决方案

 直到passwd文件
做
  回声重试
DONE
 

I have a script and want to ask the user for some information, the script cannot continue until the user fills in this information. The following is my attempt at putting a command into a loop to achieve this but it doesn't work for some reason.

echo "Please change password"
while passwd
do
echo "Try again"
done

I have tried many variations of the while loop:

while `passwd`
while [[ "`passwd`" -gt 0 ]]
while [ `passwd` -ne 0 ]]
# ... And much more

But I can't seem to get it to work.

解决方案

until passwd
do
  echo "Try again"
done

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