Hiring a Linux SysAdmin

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I am helping with the process of finding my own replacement as I recently accepted a new position. Currently I am the only sysadmin on staff so my duties are greatly varied. Everything from the phone system to mail servers, web servers, database servers, and workstations fall under my responsibilities. I came up with some technical questions and after the first couple interviews it seems I may have over estimated things I think an admin should know.

I found this programmer competency chart that is great for programmers but I cannot find anything similar for SysAdmins.

 Id love to know how you rate your sysadmin prosptects.