Below is a listing of each of the Linux commands and a brief explanation of what each of the commands do. This is a full listing which means not all the below commands will work with your distribution and may also not work because of your privileges. 

Command              Description
rcp                  Copies files from one computer to another compute
reboot               Stop the computer.
red                  Line oriented file editor.
rehash               Recomputes the internal hash table of the content
remsh                Runs a command on another computer.
repeat               Shell built-in functions to repeatedly execute ac
rgview               A programmers text editor.
rgvim                A programmers text editor.
rlogin               Establish a remote connection from your terminal
rm                   Deletes a file without confirmation (by default).
rmail                One of the ways that allows you to read/send E-Ma
rmdir                Deletes a directory.
rn                   Reads newsgroups.
route                Show / manipulate the IP routing table.
rpcinfo              Report RPC information.
rsh                  Runs a command on another computer.
rsync                Faster, flexible replacement for rcp.
rview                A programmers text editor.
rvim                 A programmers text editor.
s2p                  Convert a sed script into a Perl script.
sag                  Graphically displays the system activity data sto
sar                  Displays the activity for the CPU.
script               Records everything printed on your screen.
sdiff                Compares two files, side-by-side.
sed                  Allows you to use pre-recorded commands to make c
sendmail             Sends mail over the Internet.
set                  Set the value of an environment variable.
setenv               Set the value of an environment variable.
setfacl              Modify the Access Control List (ACL) for a file o
settime              Change file access and modification time.
sftp                 Secure file transfer program.
sh                   Runs or processes jobs through the Bourne shell.
shred                Delete a file securely, first overwriting it to h
shutdown             Turn off the computer immediately or at a specifi
sleep                Waits a x amount of seconds.
slogin               OpenSSH SSH client (remote login program).
smbclient            An ftp-like client to access SMB/CIFS resources o
sort                 Sorts the lines in a text file.
spell                Looks through a text file and reports any words t
split                Split a file into pieces.
stat                 Display file or filesystem status.
stop                 Control process execution.
strip                Discard symbols from object files.
stty                 Sets options for your terminal.
su                   Become super user or another user.
sysinfo              Get and set system information strings.
sysklogd             Linux system logging utilities.
tabs                 Set tabs on a terminal.
tail                 Delivers the last part of the file.
talk                 Talk with other logged in users.
tac                  Concatenate and print files in reverse.
tar                  Create tape archives and add or extract files.
tbl                  Preprocessor for formatting tables for nroff or t
tcopy                Copy a magnetic tape.
tcpdump              Dump traffic on a network.
tee                  Read from an input and write to a standard output
telnet               Uses the telnet protocol to connect to another re
time                 Used to time a simple command.
timex                The timex command times a command; reports proces
todos                Converts text files between DOS and Unix formats.
top                  Display Linux tasks.
touch                Change file access and modification time.
tput                 Initialize a terminal or query terminfo database.
tr                   Translate characters.
traceroute           Print the route packets take to network host.
troff                Typeset or format documents.
ul                   Reads the named filenames or terminal and does un
umask                Get or set the file mode creation mask.
unalias              Remove an alias.
unhash               Remove internal hash table.
uname                Print name of current system.
uncompress           Uncompressed compressed files.
uniq                 Report or filter out repeated lines in a file.
unmount              Crates a file systems and remote resources.
unpack               Expands a compressed file.
untar                Create tape archives and add or extract files.
until                Execute a set of actions while/until conditions a
useradd              Create a new user or updates default new user inf
userdel              Remove a users account.
usermod              Modify a users account.
vacation             Reply to mail automatically.
vedit                Screen-oriented (visual) display editor based on
vgrind               Grind nice program listings
vi                   Screen-oriented (visual) display editor based on
vim                  A programmers text editor.
view                 A programmers text editor.
w                    Show who is logged on and what they are doing.
wait                 Await process completion.
wc                   Displays a count of lines, words, and characters
whereis              Locate a binary, source, and manual page files fo
while                Repetitively execute a set of actions while/until
which                Locate a command.
who                  Displays who is on the system.
whois                Internet user name directory service.
write                Send a message to another user.
X                    Execute the X windows system.
xfd                  Display all the characters in an X font.
xlsfonts             Server font list displayer for X.
xset                 User preference utility for X.
xterm                Terminal emulator for X.
xrdb                 X server resource database utility.
yacc                 Short for yet another compiler-compiler, yacc is
yes                  Repeatedly output a line with all specified STRIN
yppasswd             Changes network password in the NIS database.
zcat                 Compress files.

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