System Administrators (SAs) have a tough job: Dealing with users and user accounts, security, patching, updates, upgrades, disk space, performance and other miscellaneous tasks often known as "other duties as assigned." For some SAs, the day never ends. Despite the challenges, pitfalls and occasional irate user; system administration is a fulfilling job with intangible rewards like no other position in IT. To assist those weary SAs in their quest to conquer their Linux systems, I've devised this list of 12 native Linux system monitoring tools that are always at my fingertips.