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Yum repository mirror for old CentOS' versions
Answer:
Most CentOS' mirrors don't host full mirror of Yum repository for all versions of CentOS. If you are using older version of CentOS, you might one-day found the yum update is broken since the mirror no longer contains the files you needed.
In this case, you can modify the file /etc/yum.repos.d/CentOS-Base.repo and change all paths point to the following:
..
baseurl=http://vault.centos.org/...
..Then do a yum update to reflect the changes.
Remove package with Yum
Answer:
You can use the following command to remove packages using yum,
e.g. remove Firefox
yum remove firefox
To remove multiple packages, try
yum remove firefox gedit
How to install bulk packages using yum with groupinstall?
Answer:
Sometimes, if you forgot to select "Development Tools" during Fedora/CentOS installations, you can add them later by using one command
yum groupinstall "Development Tools"
Which save you a lot of times from installing the needed packages one by one.
To see what options are available for groupinstall, try
yum grouplist
