Whenever you may received following error while installing package or update in your CentOS or Fedora,

We have already discussed about last command on previous post, the following content remote the ssh logged, reboot, shutdown information from logs.

Linux-Unix operating systems is logged system activities some one place. This post describe about how to get know last logged and log out, shutdown time, system reboot time from the logs. This information stored in wtmp and btmp file.

If you are still using sendmail software in system, Open your host allow file and add the below line,

Set the ownership and permission for a file using chown and chmod command, If you want to Clone ownership and permissions from another file.

Unfortunately if you have changed files and directories permission to 777. You can not reset root password and logged into user account including graphically.

Assume that, if you are working in Data Center or running your application in VPS server, we can change static IP Address without downtime and reboot your Server.