alias
Create an alias
apropos
Search Help manual pages (man -k)
awk
Find and Replace text, database sort/validate/index
break
Exit from a loop
builtin
Run a shell builtin
bzip2
Compress or decompress named file(s)
cal
Display a calendar
case
Conditionally perform a command
cat
Display the contents of a file
cd
Change Directory
cfdisk
Partition table manipulator for Linux
chgrp
Change group ownership
chmod
Change access permissions
chown
Change file owner and group
chroot
Run a command with a different root directory
cksum
Print CRC checksum and byte counts
clear
Clear terminal screen
cmp
Compare two files
comm
Compare two sorted files line by line
command
Run a command - ignoring shell functions
continue Resume the next iteration of a
loop
cp
Copy one or more files to another location
cron
Daemon to execute scheduled commands
crontab
Schedule a command to run at a later time
csplit
Split a file into context-determined pieces
cut
Divide a file into several parts
date
Display or change the date & time
dc
Desk Calculator
dd
Data Dump - Convert and copy a file
ddrescue Data recovery tool
declare
Declare variables and give them attributes
df
Display free disk space
diff
Display the differences between two files
diff3
Show differences among three files
dig
DNS lookup
dir
Briefly list directory contents
dircolors Colour setup for `ls'
dirname
Convert a full pathname to just a path
dirs
Display list of remembered directories
du
Estimate file space usage
echo
Display message on screen
egrep
Search file(s) for lines that match an extended expression
eject
Eject removable media
enable
Enable and disable builtin shell commands
env
Environment variables
ethtool
Ethernet card settings
eval
Evaluate several commands/arguments
exec
Execute a command
exit
Exit the shell
expand
Convert tabs to spaces
export
Set an environment variable
expr
Evaluate expressions
false
Do nothing, unsuccessfully
fdformat Low-level format a floppy disk
fdisk
Partition table manipulator for Linux
fgrep
Search file(s) for lines that match a fixed string
file
Determine file type
find
Search for files that meet a desired criteria
fmt
Reformat paragraph text
fold
Wrap text to fit a specified width.
for
Expand words, and execute commands
format
Format disks or tapes
free
Display memory usage
fsck
File system consistency check and repair
ftp
File Transfer Protocol
function Define Function Macros
gawk
Find and Replace text within file(s)
getopts
Parse positional parameters
grep
Search file(s) for lines that match a given pattern
groups
Print group names a user is in
gzip
Compress or decompress named file(s)
hash
Remember the full pathname of a name argument
head
Output the first part of file(s)
history
Command History
hostname Print or set system name
id
Print user and group id's
if
Conditionally perform a command
ifconfig Configure a network interface
import
Capture an X server screen and save the image to file
install
Copy files and set attributes
join
Join lines on a common field
kill
Stop a process from running
less
Display output one screen at a time
let
Perform arithmetic on shell variables
ln
Make links between files
local
Create variables
locate
Find files
logname
Print current login name
logout
Exit a login shell
look
Display lines beginning with a given string
lpc
Line printer control program
lpr
Off line print
lprint
Print a file
lprintd
Abort a print job
lprintq
List the print queue
lprm
Remove jobs from the print queue
ls List information about file(s)
lsof
List open files
make
Recompile a group of programs
man
Help manual
mkdir
Create new folder(s)
mkfifo
Make FIFOs (named pipes)
mkisofs
Create an hybrid ISO9660/JOLIET/HFS filesystem
mknod
Make block or character special files
more
Display output one screen at a time
mount
Mount a file system
mtools
Manipulate MS-DOS files
mv
Move or rename files or directories
netstat
Networking information
nice
Set the priority of a command or job
nl
Number lines and write files
nohup
Run a command immune to hangups
nslookup Query Internet name servers
interactively
passwd
Modify a user password
paste
Merge lines of files
pathchk
Check file name portability
ping
Test a network connection
popd
Restore the previous value of the current directory
pr
Prepare files for printing
printcap Printer capability database
printenv Print environment