linux - [Solved-5 Solutions] How to use sudo to redirect output to a location in Linux ? - ubuntu - red hat - debian - linux server - linux pc
Linux - Problem :
To find myself quite often needing to redirect output to a location but don't normally have write access to.
The trouble is, the following example doesn't work:
sudo ls -hal /root/ > /root/test.outclick below button to copy the code. By - Linux tutorial - team
You just receive the response:
-bash: /root/test.out: Permission deniedHow can you get this to work?
Linux - Solution 1:
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.
There are multiple solutions:
- 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'click below button to copy the code. By - Linux tutorial - team
- Create a script with your commands and run that script with sudo:
#!/bin/sh
ls -hal /root/ > /root/test.outclick below button to copy the code. By - Linux tutorial - team
Run sudo ls.sh.
- 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]$click below button to copy the code. By - Linux tutorial - team
- 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/nullclick below button to copy the code. By - Linux tutorial - team
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).
Linux - Solution 2:
sudo ls -hal /root/ | sudo tee /root/test.out > /dev/nullclick below button to copy the code. By - Linux tutorial - team
This could also be used to redirect any command, to a directory that you do not have access to. It works because the tee program is effectively an "echo to a file" program, and the redirect to /dev/null is to stop it also outputting to the screen to keep it the same as the original contrived example above.
Linux - Solution 3:
sudo ls -hal /root/ | sudo dd of=/root/test.outclick below button to copy the code. By - Linux tutorial - team
Linux - Solution 4:
sudo bash <<EOF
ls -hal /root/ > /root/test.out
EOFclick below button to copy the code. By - Linux tutorial - team
Or of course:
echo 'ls -hal /root/ > /root/test.out' | sudo bashclick below button to copy the code. By - Linux tutorial - team
Linux - Solution 5:
Make sudo run a shell, like this:
sudo sh -c "echo foo > ~root/out"