bash 将 sudo 与 for 循环一起使用
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Using sudo with for loop
提问by Axl
I want to run a simple for loop command with sudo, but it isn't working:
我想用 sudo 运行一个简单的 for 循环命令,但它不起作用:
sudo -i -u user for i in /dir; do echo $i; done
I get the following error:
我收到以下错误:
-bash: syntax error near unexpected token `do'
Probably a very simple thing I am overlooking. Any help?
可能是我忽略的一件非常简单的事情。有什么帮助吗?
回答by Jan Krüger
sudo wants a program (+arguments) as a parameter, not a piece of shell script. You can do this, though:
sudo 想要一个程序(+arguments)作为参数,而不是一段 shell 脚本。不过,您可以这样做:
sudo -i -u user sh -c 'for i in /dir; do echo $i; done'
Note the single quotes. If you used double quotes, your shell would try to expand the $ibefore sudo (or, rather, the shell run by it) ever sees it.
注意单引号。如果您使用双引号,您的 shell 会尝试$i在 sudo(或者更确切地说,由它运行的 shell)看到它之前扩展它。
PS. a separate problem, as pointed out in a comment (only six years later), is that if you want to iterate over the files in a directory, the proper syntax is for i in /dir/*. foraccepts a list, and /diris a list... with one item. /dir/*expands to a list of files in /dirdue to wildcard expansion.
附注。正如评论中指出的那样(仅六年后),另一个问题是,如果您想遍历目录中的文件,正确的语法是for i in /dir/*. for接受一个列表,并且/dir是一个列表......包含一个项目。由于通配符扩展,扩展/dir/*为文件列表/dir。
回答by BLaZuRE
You can try sudo bash -c 'commands here'
你可以试试 sudo bash -c 'commands here'
回答by evil otto
Put the sudo inside the loop:
将 sudo 放入循环中:
for i in /dir; do
sudo -u user somecommand $i
done
This won't work without extra steps if you need the other user's permissions to generate the glob for the loop, for example.
例如,如果您需要其他用户的权限来为循环生成 glob,那么如果没有额外的步骤,这将无法工作。

