Some basic Unix Linux commands short description

cd - change the working directory
rm - remove files or directories
mv - move (rename) files
mkdir - make directories
cp - copy files and directories
touch - change file timestamps
chmod - change file access permissions
chown - change file owner and group
useradd - Create a new user or update default new user information
usermod - Modify a user account
groupadd - Create a new group
groupmod - modify a group
passwd - update a user's authentication tokens(s)
chage - change user password expiry information
find - find files
locate - find files by name
udpatedb - update a database for mlocate
ps - report a snapshot of the current processes.
pstree - display a tree of processes
yum - RPM installer/updater
clear - clear the terminal screen
vim - Vi IMproved, a programmers text editor