Linux 尝试使用 sudo 将文件附加到根拥有的文件时权限被拒绝
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Permission denied when trying to append a file to a root owned file with sudo
提问by Desmond Hume
This is the shell command that results in "Permission denied" when I'm trying to append the data in a file to another file with sudo:
当我尝试使用 sudo 将文件中的数据附加到另一个文件时，这是导致“权限被拒绝”的 shell 命令：
sudo cat add_file >> /etc/file
The file at /etc/fileis owned by root(i.e. me) and its permissions are rw-r--r--. Should I become rootfor a moment to make it work or is there a workaround for sudo?
文件 at/etc/file归root（即我）所有，其权限为rw-r--r--. 我应该root暂时让它工作还是有解决方法sudo？
采纳答案by Chris Seymour
Run bashas sudo:
运行bash为sudo：
$ sudo bash -c "cat add_file >> /etc/file"
$ whoami;sudo bash -c "whoami";whoami
iiSeymour
root
iiSeymour
回答by Gilles Quenot
Try doing this instead :
尝试这样做：
sudo tee -a /etc/file < add_file
It's lighter than running bash or sh -c command
它比运行 bash 或 sh -c command
回答by Maxime Chéramy
You are trying to write the result of the command sudo cat add_fileto the file /etc/file. And apparently you don't have that right.
您正在尝试将命令的结果写入sudo cat add_file文件 /etc/file.conf 。显然你没有那个权利。
man sudogives that example :
man sudo给出那个例子：
To make a usage listing of the directories in the /home partition. Note that this runs the commands in a sub-shell to make the cd and file redirection work. $ sudo sh -c "cd /home ; du -s * | sort -rn > USAGE"
To make a usage listing of the directories in the /home partition. Note that this runs the commands in a sub-shell to make the cd and file redirection work. $ sudo sh -c "cd /home ; du -s * | sort -rn > USAGE"
So you should try :
所以你应该尝试：
sudo sh -c "cat add_file >> /etc/file"
sudo sh -c "cat add_file >> /etc/file"
回答by gniourf_gniourf
A funny possibility is to use ed(the standard editor):
一个有趣的可能性是使用ed（标准编辑器）：
sudo ed -s /etc/file <<< $'r add_file\nwq'
I know I won't get upvoted for this wonderful answer, but I wanted to include it here anyway (because it's funny). Done!
我知道我不会因为这个精彩的答案而获得赞誉，但无论如何我还是想把它包括在这里（因为它很有趣）。完毕！
回答by Montells
try
尝试
sudo bash -c 'cat add_file >> /etc/file'
or
或者
cat add_file | sudo tee -a /etc/file > /dev/null
回答by kenorb
Similar approach to @gniourf_gniourfanswer, but using ex:
与@gniourf_gniourf答案类似的方法，但使用ex：
sudo ex +"r in.txt" -cwq out.txt
which is equivalent to vi/vimEx-mode (-e).
相当于 vi/ vimEx-mode ( -e)。
This in-place edit example is simple, safe and convenient approach, because it doesn't use any shell piping, FIFOs or shell within the shell workarounds.
这个就地编辑示例是简单、安全和方便的方法，因为它在外壳变通方法中不使用任何外壳管道、FIFO 或外壳。
To boost performance for scripting purposes, consider using silence mode (-s).
为了提高脚本编写的性能，请考虑使用静音模式 ( -s)。
