Yum

YUM on Oracle Linux 7

Download yum 

Lists all enabled repositories.
yum repolist

Lists all packages that are available in all enabled repositories and all packages that are installed on your system.
yum list

To list packages installed or available 
yum list installed
yum list available

To search package with stream asm 
yum search asm. 
yum search rdbms

To Finds the name of the package to which the specified file or feature belongs.
yum provides /etc/sysconfig/atd

To display information about package
yum info package

To install package 
yum install package

To check updates 
yum check-update

To update specific packages
yum update package

To update all packages
yum update

To remove a package 
yum remove package

To eraser a packages
yum erase package

To clean all cached package downloads, it is good when there are any problem with yum  
yum clean all                    # no function yum despues 

To help
yum help
yum help command

interactive shell

yum shell