badblocks - search a device for bad blocks
bind - bind a name to a socket
chdir - change current working directory
chroot - run command or interactive shell with special root directory
clear - sweep terminal screen
column - columnate lists
cut - remove sections from each line of files
dig - DNS lookup utility
dmesg - display the system message buffer
dmidecode - DMI table decoder
eject - eject removable media
exit - cause normal process termination
factor - primes, factor a number, generate large primes
fdisk - Partition table manipulator
finger - user information lookup program
free - display amount of free and used memory in the system
fsck - file system consistency check and interactive repair
grep - print lines matching a pattern
groups - show group memberships
gzip - compression/decompression tool
help - display help information
history - GNU History Library
hostname - set or print name of current host system
htop - interactive process viewer
iostat - report I/O statistics
killall - kill processes by name
last - indicate last logins of users and ttys
locate - find filenames quickly
login - log into the computer
logout - log out the session
lsof - list open files
mktemp - create a temporary file or directory
mount - filesystem change name space
nano - editor, an enhanced free Pico clone
netstat - show network status and statistics
nmap - Network exploration tool and security / port scanner
read - read from a file descriptor
set - change the options and positional parameters
scp - secure copy (remote file copy program)
screen - screen manager with VT100/ANSI terminal emulation
stat - display file status
passwd - modify a user's password
ping - send ICMP ECHO_REQUEST packets to network hosts
reboot - stopping and restarting the system
rsync - a fast, versatile, remote (and local) file-copying tool
scrot - command line screen capture utility
shutdown - close down the system at a given time
ssh - OpenSSH SSH client (remote login program)
sudo - execute a command as another user
swapon, swapoff - enable/disable devices and files for paging and swapping
sync - force completion of pending disk writes (flush cache)
tar - manipulate tape archives
telnet - user interface to the TELNET protocol
tcpdump - dump traffic on a network
tree - list contents of directories in a tree-like format
uname - display information about the system
unset - remove variable or function names
uptime - show how long system has been running
rev - reverse lines of a file
whatis - search manual page databases
which - locate a program file in the user's path
whoami - display effective user id
whois - domain name and network number directory service
wipe - securely erase files from magnetic media