pwd – print name of current/working directory

rm – remove files or directories

rmdir – remove empty directories

route – show / manipulate the IP routing table

sed – stream editor for filtering and transforming text

shutdown – bring the system down

sleep – delay for a specified amount of time

sort – sort lines of text files

ssh – OpenSSH SSH client (remote login program)

strace – trace system calls and signals

strings – print the strings of printable characters in files

su – change user ID or become super-user

tail – output the last part of files

tar – The GNU version of the tar archiving utility

telnet – user interface to the TELNET protocol

time – run programs and summarize system resource usage

true -do nothing, successfully

umount – unmount file systems

uname – print system information

useradd – create a new user or update default new user information

userdel – delete a user account and related files

uptime – Tell how long the system has been running

vi – a programmers text editor

vim – Vi IMproved, a programmers text editor

w – Show who is logged on and what they are doing

wc – print the number of newlines, words, and bytes in files

whatis – display manual page description

whereis – locate the binary, source, and manual page files for a command

which – locate a command

who – show who is logged on

whoami – print effective user id

write – send a message to another user