maemo.org - Talk - View Single Post - [CLI] how to become root

ceefour	2010-05-27 , 07:36
Posts: 36 \| Thanked: 13 times \| Joined on Dec 2009 @ Bandung, Indonesia	#26

Originally Posted by nokian-series

Before reflash, i easly can do:
sudo echo 900000 > /sys/devices/system/cpu/cpu0/cpufreq/scaling_max_freq

I don't think you could do that even before reflash.

Your command will run echo as root, but then pipe to a privileged file *without* root privileges.

For example, the following code rightly fails on my Ubuntu system (and on any Linux system):

Code:

$ sudo echo a > /hello
bash: /hello: Permission denied

What you should do is like this:

Code:

echo 900000 | sudo tee /sys/devices/system/cpu/cpu0/cpufreq/scaling_max_freq

(but you have to get sudo working correctly first)