A good sysadmin automates everything he can. It saves time, makes everything uniform, and reduces errors (it can multiply errors but at least they're all the same error).
A good sysadmin documents everything he does. Code, configurations, everything. You want it to be easy for not just yourself to figure out what you did, but your colleagues, customers, or your replacement.
A good sysadmin uninstalls programs that are no longer needed. He doesn't leave 50 old or unused versions of scripts laying around. Not just to save disk space or reduce system resources, but for security and to avoid confusion.
A good sysadmin automates everything he can. It saves time, makes everything uniform, and reduces errors (it can multiply errors but at least they're all the same error).
A good sysadmin documents everything he does. Code, configurations, everything. You want it to be easy for not just yourself to figure out what you did, but your colleagues, customers, or your replacement.
A good sysadmin uninstalls programs that are no longer needed. He doesn't leave 50 old or unused versions of scripts laying around. Not just to save disk space or reduce system resources, but for security and to avoid confusion.