The essential Linux Administration cheat sheet: 8 concise chapters you can read in minutes, distilled from the full deck. When you're ready, drill the flashcards or test yourself under exam conditions.
The Linux shell becomes powerful when its small utilities are combined with pipes and redirection. The command ls lists directory contents and accepts flags such as -l for long for...
Read full chapter →Linux organizes the entire system under a single hierarchical tree rooted at /. A few top-level directories deserve attention: /etc holds system-wide configuration such as /etc/pas...
Read full chapter →Every running program on Linux is a process identified by a PID, and operators routinely need to inspect, signal, and reorder them. The ps command produces a static snapshot: ps au...
Read full chapter →User and group administration underpins access control. New accounts are created with useradd -m -s /bin/bash john (the -m flag provisions a home directory), passwords set with pas...
Read full chapter →Modern Linux configures networking through the ip suite, which supersedes the older ifconfig and route. ip addr show lists addresses and their interfaces, ip link show enumerates l...
Read full chapter →Disk management starts with discovery. lsblk lists block devices in a tree (disks, partitions, and their mount points), and lsblk -f adds the filesystem type and UUID. df -h report...
Read full chapter →Bash scripts glue the system's utilities together, and mastering variables, control flow, and exit handling unlocks real automation. Variables are assigned without spaces around =...
Read full chapter →Observability starts with what the kernel exposes. The traditional ring buffer holds boot and runtime messages that dmesg can dump (dmesg -T for human timestamps, dmesg -w to follo...
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