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tune2fs also provides the same information . But the information does not give the current usage , it gives the information when the file system was last mounted.
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
Sometimes we may want to run a script when a system reboots . We can simply do this by just scheduling the script using vixie cron with the @reboot option .
I use it to send me an alert message on our prod hosts to send an alert message when the system reboots .
@reboot zaman uptime | echo `uptime` | mail -s "`uname -n` got rebooted" firstname.lastname@example.org