如何使用sudo将输出重定向到我没有写权限的位置? [英] How do I use sudo to redirect output to a location I don't have permission to write to?

问题描述

我已经在我们的开发RedHat linux机器上获得了sudo访问权限，而且我似乎经常需要将输出重定向到我通常没有写权限的位置.

I've been given sudo access on one of our development RedHat linux boxes, and I seem to find myself quite often needing to redirect output to a location I don't normally have write access to.

麻烦的是，这个人为的例子不起作用:

The trouble is, this contrived example doesn't work:

sudo ls -hal /root/ > /root/test.out

我刚刚收到回复:

-bash: /root/test.out: Permission denied

如何使它正常工作?

推荐答案

您的命令不起作用，因为重定向是由您的Shell执行的，该Shell没有写/root/test.out的权限. sudo不会执行输出的重定向.

Your command does not work because the redirection is performed by your shell which does not have the permission to write to /root/test.out. The redirection of the output is not performed by sudo.

有多种解决方案:

• 使用sudo运行shell并使用-c选项向其发出命令:

sudo sh -c 'ls -hal /root/ > /root/test.out'

使用命令创建脚本并使用sudo运行该脚本:

Create a script with your commands and run that script with sudo:

#!/bin/sh
ls -hal /root/ > /root/test.out

运行sudo ls.sh.如果您不想创建临时文件，请参见Steve Bennett的 answer .

Run sudo ls.sh. See Steve Bennett's answer if you don't want to create a temporary file.

使用sudo -s启动外壳，然后运行命令:

Launch a shell with sudo -s then run your commands:

[nobody@so]$ sudo -s
[root@so]# ls -hal /root/ > /root/test.out
[root@so]# ^D
[nobody@so]$

使用sudo tee(如果使用-c选项时必须逃避很多):

Use sudo tee (if you have to escape a lot when using the -c option):

sudo ls -hal /root/ | sudo tee /root/test.out > /dev/null

需要重定向到/dev/null才能停止 tee 从输出到屏幕. 追加，而不是覆盖输出文件 (>>)，tee -a或tee --append(最后一个特定于 GNU coreutils ).

The redirect to /dev/null is needed to stop tee from outputting to the screen. To append instead of overwriting the output file (>>), use tee -a or tee --append (the last one is specific to GNU coreutils).

感谢访问 Jd ， Adam J. Forster 和 Johnathan .

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