ls - list storage

pwd - present working directory

cd - change directory

file - to know file type

locate - locate the file

which - command to find a command

history - history of commands

whatis - to get what command does

appropos - command to get info about command what it does

man - manual page

mkdir - create a directory

touch - create a empty file / update date on a file

cp - createa copy of file / edit a file without removing

mv - move a file / rename a file

rm -r direct_name ->remove a directory

rmdir - remove a directory if it contains nothing

cat - concatenate

sudo - super user do

chmod - change a mode

users - who are logged into system

killall - kill a process

chsh - change shell

env - environmental variable

lscpu - cpu information

lshw - hardware information