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We sometimes need to change kernel parameters by echoing the file . This needs root privilege and if we do it using sudo like this , it fails
sudo echo ondemand > /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
-bash: /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor: Permission denied
We can achieve this with the tee command by just doing sudo without logging as root user
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