Understanding Linux and your terminal

Articles

• bash — the command shell — A command interpreter for interactive input, builtins, and shell scripts.
• hostname — machine names and resolution — Reads or temporarily sets the host name; selected options report FQDNs and addresses.
• uname — kernel and system information — Reports kernel identity, node name, and machine architecture, not the distribution release.
• whoami — identify the effective user — whoami prints the user name tied to the process's effective user ID — the account you act as now.
• The kernel — The core of the operating system: it manages processes, memory, devices, and filesystems; programs request its services through system calls. uname -r prints its version.
• Service — A program that runs in the background and performs a function for the system or network. Under systemd, a service is described by a .service unit and managed with systemctl.
• hostnamectl — host name and machine info — View and change the host name and machine info; /etc/hostname and /etc/hosts.