Kick user/ terminal on linux

## show user
~# w
##
## kick terminal
~# skill -KILL -v pts/0
##
## kick user
~# skill -KILL -u user
##
## Stop/Pauseuser activites
~# skill -STOP -u user
##
## Resume a stopped user
~# skill -CONT -u user

http://servercomputing.blogspot.com/2012/01/kill-and-logout-users-in-pts-linux.html

Save power through dynamic frequency

the program split in 2 part:
a program set something and call the script to manage the frequency

/etc/local.d/powerSave.start

#!/bin/bash #Runtime Power Management for i in `find /sys/devices/*/power/control`; do echo auto > $i; done; #USB Autosuspend for i in `find /sys/bus/usb/devices/*/power/level`; do echo auto > $i; done; for i in `find /sys/bus/usb/devices/*/power/autosuspend`; do echo 2 > $i; done; #Use script to mgmt the frequency cpufreq-set -r -g userspace echo `date +"%a %b %d %T"` dynamicFrequency start >> /var/log/dynamicFrequency.log /sbin/dynamicFrequency.py

/etc/local.d/powerSave.stop

#!/bin/bash kill $(cat /var/run/dynamicFrequency.pid) cpufreq-set -r -g performance echo `date +"%a %b %d %T"` dynamicFrequency Stop >> /var/log/dynamicFrequency.log

/sbin/dynamicFrequency.py

#!/usr/bin/python3.2 """\ This program select a scaling available frequencies based on loadavg for example the available frequencies: 350000 700000 1050000 1400000 1750000 2100000 2450000 2800000 the current frequencies is 175000 if load >= 80% the frequencies jump 2 step (245000) if load >= 60% the frequencies jump 1 step (210000) if load < 20% the frequencies jump -2 step (1050000) if load < 40% the frequencies jump -1 step (1400000) """ import os # Write the pid into pid_path = '/var/run/dynamicFrequency.pid' pidFile=None if os.path.exists(pid_path): pidFile = open(pid_path, 'w') else: pidFile = open(pid_path, 'a') pidFile.write(str(os.getpid())) pidFile.close() scaling_available_frequencies = None with open('/sys/devices/system/cpu/cpu0/cpufreq/scaling_available_frequencies', 'r') as file: scaling_available_frequencies = file.read().strip().split() current_frequencies = None with open('/sys/devices/system/cpu/cpu0/cpufreq/scaling_cur_freq', 'r') as file: raw_current_frequencies = file.read().strip() if raw_current_frequencies in scaling_available_frequencies: current_frequencies = scaling_available_frequencies.index(raw_current_frequencies) else: current_frequencies = len(scaling_available_frequencies) from decimal import * from time import sleep max = len(scaling_available_frequencies) - 1 while True: loadavg = None with open('/proc/loadavg', 'r') as file: loadavg = Decimal(file.read().strip()[0]) change = 0 if loadavg >= Decimal(0.80): change = 2 elif loadavg >= Decimal(0.60): change = 1 elif loadavg < Decimal(0.20): change = -2 elif loadavg < Decimal(0.40): change = -1 plan=None if current_frequencies + change >= max: plan = max elif current_frequencies + change < 0: plan = 0 else: plan = current_frequencies + change if plan != current_frequencies: current_frequencies = plan with open('/sys/devices/system/cpu/cpu0/cpufreq/scaling_setspeed', 'w') as file: file.write(scaling_available_frequencies[current_frequencies]) os.system('echo `date +"%a %b %d %T"` dynamicFrequency' + ' loadavg:' + str(loadavg) + ' change frequency to:' + \ scaling_available_frequencies[plan] + ' >> /var/log/dynamicFrequency.log') sleep(5)

Reference:

https://wiki.archlinux.org/index.php/CPU_Frequency_Scaling