To update password without knowing the password
cat /etc/shadow | grep username
echo 'username:mdsum' | chpasswd -e
To remove first five characters using sed
sed 's/^.....//'Add user kevins to secondary group named test
usermod -a -G test kevinsRef: http://linux.101hacks.com/sysadmin-tasks/assign-new-group-to-use/, http://www.cyberciti.biz/faq/howto-linux-add-user-to-group/
Linux Perf Analysis in 60s
http://techblog.netflix.com/2015/11/linux-performance-analysis-in-60s.htmlHow do I determine ethernet connection speed?
ethtool eth0
rsync
https://www.howtogeek.com/135533/how-to-use-rsync-to-backup-your-data-on-linux/
cron
http://serverfault.com/questions/449651/why-is-my-crontab-not-working-and-how-can-i-troubleshoot-it
http://serverfault.com/questions/449651/why-is-my-crontab-not-working-and-how-can-i-troubleshoot-it
http://www.nncron.ru/help/EN/working/cron-format.htm
account admin
https://www.howtogeek.com/50787/add-a-user-to-a-group-or-second-group-on-linux/
http://www.golinuxhub.com/2014/08/how-to-check-lock-status-of-any-user.html
https://unix.stackexchange.com/questions/10852/whats-the-difference-between-sbin-nologin-and-bin-false
network issues
https://www.digitalocean.com/community/tutorials/how-to-use-traceroute-and-mtr-to-diagnose-network-issues
netstat
https://www.cyberciti.biz/faq/what-process-has-open-linux-port/
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