Sysadmins are the unsung heroes of the information age, working behind the scenes to configure, maintain, and troubleshoot the computer infrastructure that underlies much of modern life. While GUIs are being offered for system administrators, they mostly continue to use CLIs. Command-Line Interfaces (CLIs) are typically the interface of choice for most sysadmin tasks, with Graphical User Interfaces (GUIs) occasionally used under some situations. In this paper we provide insight for this preference based on an extensive survey, analyze why these power users perceive CLIs more effective than GUIs, and discuss findings also supported by observations from field studies. Our analysis indicates that cognition-based trust and monitoring play major roles in the system administration tool selection.