YUM based, on the fly package manipulation tool for CentOS 6 the only cmd: # repo requirements: 1) yum plugin: priorities 2) explicit definition of 'enabled' and 'prioroty' properties for each repository channel, in "/etc/yum.repos.d/*.repo" -files. 3) the 'repo' -file itself and all files under 'bin' subdirectory must chmod +x 4) the 'repo' file must be available on the path. recomended directory is: '/root/bin' (because of some hardcoded parts in the script...).