Script to add external repository for centOS-updates, update BASH then remove the external repository?

We have multiple servers that utilize internal REPO's that are locked. These servers range from versions centOS 5.7 to 6.5. Is there a way to write a script that can be executed that:

1. Add external repository (centOS-updates mirrors for example)
2. Update BASH to latest using YUM or rpm -Uvh
3. Remove the lines added initially for an external repository
LVL 2
meade470Asked:
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Seth SimmonsSr. Systems AdministratorCommented:
i would make a copy of the repo file then append the file with the repo info, do yum then remove the main (modified) file and rename the original back to what it was
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Nick UpsonPrincipal Operations EngineerCommented:
I'd just copy the bash rpm file to each server and then run "yum localupdate bash.rpm" - job done
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