Systemd is the init system and service manager for RHEL 9 — it is PID 1, the parent of every other process on the system. Understanding how to manage systemd services is foundational to every other administrative task: installing Nginx means enabling the nginx service; configuring a database means understanding its unit file; debugging a […]
The sudo (superuser do) tool allows designated users to run commands with elevated privileges without sharing the root password. This is fundamental to the principle of least privilege: each administrator gets exactly the access they need for their role, no more. When access is misconfigured — for example with blanket ALL=(ALL) ALL entries or unsafe […]
Every time you open a terminal on RHEL 9, Bash reads one or more startup files before presenting you with a prompt. Which files are read depends on whether the shell is a login shell (started by SSH, a console login, or su -) or an interactive non-login shell (a new terminal window in a […]
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