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Image by Linux Foundation via linuxfoundation.org
Here is the Evolution of a Sysadmin:
LINUX BEGINNER
Knows how to install Linux, install programs, interactions is GUI-based.
ENTHUSIAST ADMIN
Set up a home server, use the command line, experiment with LAMP, try basic networking, test out virtualization.
NOVICE SYSADMIN
Navigate a filesystem, edit files, use basic utils and commands, install system-wide software and create users.
JUNIOR SYSADMIN
Familiar with system configuration management, resource sharing, basic networking concepts, familiar with basic Linux sysadmin tools, mount remote file systems.
INTERMEDIATE/ADVANCED SYSADMIN
Managing processes and services, system installation and configuration, fundamental security, configuration management, write scripts in Perl, Python, etc.
SENIOR SYSADMIN
Solve problems quickly and automate processes, understand paging and swapping, inter-process communications, device and what device drivers do, filesystem concepts, performance tuning, distributed computing.