yum
From access.redhat.com:
"Yum searches numerous repositories for packages and their dependencies so they may be installed together in an effort to alleviate dependency issues. Red Hat Enterprise Linux 5 uses Yum to fetch packages and install RPMs. Yum uses a configuration file at /etc/yum.conf. Also refer yum(8) man page for more information."
installing a package with yum: sudo yum install gsl
check version of yum package: sudo yum info gsl
more yum commands: link
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