These are my links for 18 mag 2012 through 20 mag 2012:

• Linux system administrator and Oracle DBA guide: How to use rman backup to duplicate database and change db_name – Environment: OL 5.7 32bit, Oracle database 11.2, sid=orcl
  Objective: duplicate database on the same server then change db_name from orcl to devdb
  concept: duplicate line in /etc/oratab, make orcl and devdb instance, then make everything in password file, spfile/pfile, controlfile, redo log, data file from orcl to devdb, only leave db_name in pfile/spfile as orcl for rman restore from orcl database backup, then use nid to change db_name
• Linux system administrator and Oracle DBA guide: How to add LUN disk online under CentOS 6.2 – Environment: CentOS 6.2 64bit with multipath connected to HP EVA storage, the LUN disk was LVM disk
  Objective: add a new LUN disk for server online and add into the existing LVM to make the partition size bigger
  scenario: LVM add new lun disk, increase the existing lvm lun disk, increase the existing partition disk such as /dev/sda1
• Git Client – SmartGit – SmartGit is a graphical client for the Open Source version control systems Git, Mercurial and SVN. It runs on Windows, Mac OS X and Linux.
  SmartGit helps Git and Mercurial beginners to get started quickly and lets advanced users become more productive with its efficient user interface.