CentOS Linux Distribution Reference

CentOS boot screen- show messages

CentOS 6 comes with a splash screen that displays a progress bar as it boots. You can hit any key during the boot process to make the boot splash screen disappear and display what its doing when its booting.

To make CentOS 6 display the details about what its doing while it boots, first make a backup of the file at /etc/grub.conf

Open /etc/grub.conf in vi and look for the line(s) that begin with ‘kernel’. At the end of them you’ll see ‘rhgb’ and ‘quiet’. Remove both of those words from grub.conf. After saving, reboot the server.

 title CentOS Linux (2.6.32-71.29.1.el6.x86_64)

 root (hd0,0)

 kernel /vmlinuz-2.6.32-71.29.1.el6.x86_64 ro root=UUID=c209fbd2-0738-4672-b225-6a5c09f65ad2 rd_NO_LUKS rd_NO_LVM rd_NO_MD rd_NO_DM LANG=en_US.UTF-8 SYSFONT=latarcyrheb-sun16 KEYBOARDTYPE=pc KEYTABLE=us crashkernel=auto rhgb quiet
 
 initrd /initramfs-2.6.32-71.29.1.el6.x86_64.img

source: http://blog.nexcess.net/2011/08/22/making-the-centos-6-boot-splash-screen-more-verbose/

yum versus rpm

RPM is a package manager while YUM is a frontend that can be used with RPM. YUM deals with more dependencies whereas RPM all too frequently does not.

You can 'yum' to install a package and dependencies (additional packages needed to make your package work.)

CentOS How to install lrzsz offering rz and sz commands

# yum install lrzsz

In any unix environment you can extract tzg files

# gtar xzvf foo.tgz

or using gzip and tar

# gzip -d foo.tgz
# tar xvf foo.tar