System information

Overview

Since we will use many different Linux systems, we need to learn the structure and the information about the system, its processes, network configurations, users, directories, user settings, and the corresponding parameters.

Common tools

Command	Description
whoami	Displays current username.
id	Returns users identity
hostname	Sets or prints the name of current host system.
uname	Prints basic information about the operating system name and system hardware.
pwd	Returns working directory name.
ifconfig	The ifconfig utility is used to assign or to view an address to a network interface and/or configure network interface parameters.
ip	Ip is a utility to show or manipulate routing, network devices, interfaces and tunnels.
netstat	Shows network status.
ss	Another utility to investigate sockets.
ps	Shows process status.
who	Displays who is logged in.
env	Prints environment or sets and executes command.
lsblk	Lists block devices.
lsusb	Lists USB devices
lsof	Lists opened files.
lspci	Lists PCI devices.