RPM

rpm -qa # list of intalled packages
rpm -ivh item.rpm # install rpm package

YUM

yum update
yum list installed
yum search item
yum repolist all

yum whatprovides "*/bin/whois"
yum –nogpgcheck install item.rpm # install rpm package

yum -y install yum-utils # install yum tools

yum install yum-downloadonly # download packages
yum update httpd -y --downloadonly --downloaddir=/tmp # download packages

versionlock

yum -y install yum-versionlock
yum versionlock list
yum versionlock $PACKAGE # yum versionlock add $PACKAGE
yum versionlock delete $PACKAGE

clean

yum clean headers && yum clean packages && yum clean metadata
yum clean all

YUMDOWNLOADER

yumdownloader httpd # only download package

TRICK

chkconfig

list all auto-start daemon

chkconfig --list

reinitialize network config

rm /etc/udev/rules.d/70-persistent-net.rules # delete cache

uuidgen eth0 >> /etc/sysconfig/network-scripts/ifcfg-eth0
nano /etc/sysconfig/network-scripts/ifcfg-eth0