Tweak system files without invoking a root shell

echo "Whatever you need" | sudo tee [-a] /etc/system-file.cfg
only for sudo-style systems. Use this construct instead of I/O re-directors ``>'' or ``>>'' because sudo only elevates the commands and *not* the re-directors. ***warning: remember that the `tee` command will clobber file contents unless it is given the ``-a'' argument Also, for extra security, the "left" command is still run unprivileged.
Sample Output
$ echo "74.125.45.100 google.com" >> /etc/hosts
bash: /etc/hosts: Permission denied
$ sudo echo "74.125.45.100 google.com" >> /etc/hosts
bash: /etc/hosts: Permission denied
$ echo "74.125.45.100 google.com" | sudo tee -a /etc/hosts

4
By: asmoore82
2009-03-09 01:33:31

What Others Think

sudo vim /etc/system-file.cfg
linuxrawkstar · 501 weeks and 4 days ago
[quote]sudo vim /etc/system-file.cfg[/quote] Yes, of course, but if all you need to do is replace the contents of a file with a one-liner, the pipe is quicker - esp. when remotely managing a server. If you need to type the full path of some file into a config file, the pipe is quicker **and more accurate** such as: ls /var/log/samba/log.winbindd | sudo tee -a /etc/some-file.cfg sudo vi /etc/some-file.cfg ... you will know if your path and file are correct before even vim-ing the config file.
asmoore82 · 501 weeks and 4 days ago

What do you think?

Any thoughts on this command? Does it work on your machine? Can you do the same thing with only 14 characters?

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