.. man lernt halt ständig dazu. Quelle in diesem Fall von
http://lwn.net/Articles/482344/
Quick Quiz 3: I typed the following command:
sudo echo 800000 > /sys/devices/system/cpu/cpu1/cpufreq/scaling_max_freq
Despite the sudo, I got “Permission denied”. Why doesn't sudo give me
sufficient
permissions?
Answer: Although that command does give echo sufficient permissions, the actual
redirection is carried out by the parent shell process, which evidently does
not have sufficient permissions to open the file for writing. One way to work
around this is sudo bash followed by the echo, or to do something like:
sudo sh -c 'echo 800000 >
/sys/devices/system/cpu/cpu1/cpufreq/scaling_max_freq'
Another approach is to use tee, for example:
echo 800000 | sudo tee /sys/devices/system/cpu/cpu1/cpufreq/scaling_max_freq
Yet another approach uses dd as follows:
echo 800000 | sudo dd
of=/sys/devices/system/cpu/cpu1/cpufreq/scaling_max_freq
Solche und ähnliche "unerklärlichen" Vorgänge haben mich gelehrt, gleich als
root zu arbeiten. (Was natürlich politisch nicht korrekt ist.)
Viele Grüße!
Bernhard
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