What language should a Linux/UNIX system admin learn?

There are many languages for Linux/Unix system administrators to choose, such as Shell,Ruby,Perl and Python. To improve the efficiency of system administration and ensure the security of a large Linux/UNIX system. What's your experience? What language should a Linux/UNIX system administrator learn?

+1 (0 person wants to ask the same question) Posted at 2012-06-23 11:46:56