您的命令不起作用，因为重定向是由您的shell执行的，shell没有写入/root/test.out的权限。输出的重定向不是由sudo执行的。

有多种解决方案:

Run a shell with sudo and give the command to it by using the -c option: sudo sh -c 'ls -hal /root/ > /root/test.out' Create a script with your commands and run that script with sudo: #!/bin/sh ls -hal /root/ > /root/test.out Run sudo ls.sh. See Steve Bennett's answer if you don't want to create a temporary file. 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]$ 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 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Jd, Adam J. Forster和Johnathan的第二，第三和第四个解决方案。

问题是命令在sudo下运行，而重定向在您的用户下运行。这是由shell完成的，对此您几乎无能为力。

sudo command > /some/file.log
`-----v-----'`-------v-------'
   command       redirection

通常绕过这个的方法是:

Wrap the commands in a script which you call under sudo. If the commands and/or log file changes, you can make the script take these as arguments. For example: sudo log_script command /log/file.txt Call a shell and pass the command line as a parameter with -c This is especially useful for one off compound commands. For example: sudo bash -c "{ command1 arg; command2 arg; } > /log/file.txt" Arrange a pipe/subshell with required rights (i.e. sudo) # Read and append to a file cat ./'file1.txt' | sudo tee -a '/log/file.txt' > '/dev/null'; # Store both stdout and stderr streams in a file { command1 arg; command2 arg; } |& sudo tee -a '/log/file.txt' > '/dev/null';

刚才有人建议sudo tee:

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

这也可以用于将任何命令重定向到您没有访问权限的目录。它之所以有效，是因为tee程序实际上是一个“回显到文件”程序，重定向到/dev/null是为了阻止它也输出到屏幕，以保持它与上面最初的人为示例相同。

sudo at now  
at> echo test > /tmp/test.out  
at> <EOT>  
job 1 at Thu Sep 21 10:49:00 2017  

也许你只被授予sudo访问一些程序/路径?那就没办法做你想做的事了。(除非你能破解)

如果不是这样，那么也许你可以编写bash脚本:

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

按ctrl + d:

chmod a+x myscript.sh
sudo myscript.sh

希望能有所帮助。

我自己发现的一个把戏

sudo ls -hal /root/ | sudo dd of=/root/test.out