awk – Pattern scanning and processing language

bash – GNU Bourne-Again Shell

biff – Be notified when mail arrives (currently not installed)

cat – Concatenate files and print on the standard output

cd – Change directory

chage – Change user password expiry information

chgrp – Change group ownership

chmod – change file access permissions

chown – change file owner and group

chroot – run command or interactive shell with special root directory

chsh – change login shell

clear – clear the terminal screen

cp – copy files and directoriesman

crontab – maintain crontab files for individual users

cut – remove sections from each line of files

date – print or set the system date and time

dd – convert and copy a file

df – report file system disk space usage

diff – compare files line by line

dig – DNS look up utility

dmesg – print or control the kernel ring buffer

dnsdomainname – show the system DNS domain name

echo – display a line of text

env – run a program in a modified environment

false – do nothing, unsuccessfully

fdisk – partition table manipulator for linux (be careful when you use it)

find – search for files in a directory hierarchy

free – display amount of free and used memory in the system