Command manuals for information

date - print or set the system date and time

dig - DNS lookup utility

discover — hardware detection utility

dmesg - print or control the kernel ring buffer

du - estimate file space usage

host - DNS lookup utility

hostname - show or set the system's host name

htop, pcp-htop - interactive process viewer

id - print real and effective user and group IDs

ip - show / manipulate routing, network devices, interfaces and tunnels

journalctl - Print log entries from the systemd journal

lscpu - display information about the CPU architecture

nc — arbitrary TCP and UDP connections and listens

nslookup - query Internet name servers interactively

ping - send ICMP ECHO_REQUEST to network hosts

pinky - lightweight finger

pstree - display a tree of processes

realpath - print the resolved path

sqlite3 - A command line interface for SQLite version 3

traceroute - print the route packets trace to network host

uname - print system information

uptime - Tell how long the system has been running.

whoami - print effective user name