How to change the default kernel in GRUB for CentOS 7 and RHEL 7 servers?....

How to change the default kernel in GRUB for CentOS 7 and RHEL 7 servers?....
This post describes how to check package content in Oracle Solaris 10.....
This command will remove all files which older than 365 days. Be careful when you need to run this command. Before add "rm" use "ls" option to see that files......
This documentation shows how to send dump request to a server which hangs. It 'll help you to analyze the problem.....
This documentation shows how to migrate an SVM device which is controlled by cluster diskset.....
How to check if sylogd process running properly for HP-UX?....