Linux and Unix Command

File/Directory Basics
ls	List files
cp	Copy files
mv	Rename files
rm	Delete files
ln	Link files
cd	Change directory
pwd	Print current directory name
mkdir	Create directory
rmdir	Delete directory
File Viewing
cat	View files
less	Page trough files
head	View file beginning
tail	View files ending
nl	Number lines
od	View binary files
xxd	View binary files
gv	View Postscript/PDF files
xdvi	View TeX DVI files
File Creation and Editing
emacs	Text editor
vim	Text editor
umask	Set default file protections
soffice	Edit Word/Excel/PowerPoint docs
abiword	Edit Word documents
gnumeric	Edit Excel documents
File Properties
stat	Display file attributes
wc	Count bytes/words/lines
du	Measure disk usage
file	Identify file types
touch	Change file timestamps
chown	Change file owner
chgrp	Change file group
chmod	Change file protections
chattr	Change advanced file attributes
Isattr	List advanced file attributes
File Location
find	Locate files
slocate	Locate files via index
which	Locate commands
whereis	Locate standard files
File Text Manipulation
grep	Search text for matching lines
cut	Extract columns
paste	Append columns
tr	Translate characters
sort	Sort lines
uniq	Locate indentical lines
tee	Copy stdin to file and to stdout simultaneously
File Compression
gzip	Compress files (GNU Zip)
Compress	Compress files (Unix)
bzip2	Compress files (BZip2)
zip	Compress files (Windows Zip)
File Comparison
diff	Compare files line by line
comm	Compare sorted files
cmp	Compare files byte by byte
md5sum	Compute Checksums
Disks and Filesystems
df	Show free disk space
mount	Make a disk accessible
fsck	Check a disk for errors
sync	Flush disk caches
Backups and Remote Storage
mt	Control a type drive
dump	Back up a disk
restore	Restore a dump
tar	Read/write type archives
cdrecord	Burn a CD
rsync	Mirror a set of files
Printing
lpr	Print files
lpq	View print queue
lprm	Remove print jobs
Spelling Operations
look	Look up spelling
aspell	Check spelling interactively
spell	Check spelling in batch
Processes
ps	List all processes
w	List users' processes
uptime	View the system load
top	Monitor processes
xload	Monitor system load
free	Display free memory
kill	Terminate processes
nice	Set process priorities
renice	Change process priorities
Scheduling Jobs
sleep	Wait for some time
watch	Run programs at set intervals
at	Schedule a job
crontab	Schedule repeated jobs
Hosts
uname	Print system information
hostname	Print the system's hostname
ifconfig	Set/display network information
host	Look up DNS
whois	Lookup domain registrants
ping	Check if host is reachable
traceroute	View network path to a host
Networking
ssh	Securely log into remote hosts
telnet	Log into remote hosts
scp	Securely copy files between hosts
stfp	Securely copy files between hosts
ftp	Copy files between hosts
evolution	GUI email client
mutt	Text-based email client
mail	Minimal email client
mozilla	Web browser
lynx	Text-only web browser
wget	Retrieve web pages to disk
slrn	Read Usenet news
gaim	Instant messaging/IRC
talk	Linux/Unix chat
write	Send messages to a termainal
mesg	Prohibit talk/write
Audio and Video
grip	Play CDs and rip MP3s
xmms	Play audio files
cdparanoia	Rip audio
audacity	Edit audio
xcdroast	Burn CDs

-How to using Terminal?
https://help.ubuntu.com/community/UsingTheTerminal

-How do I open a terminal?
http://askubuntu.com/questions/183775/how-do-i-open-a-terminal

-How do I restart shutdown from a terminal?
http://askubuntu.com/questions/187071/how-do-i-restart-shutdown-from-a-terminal

-How do you open a command line?
http://askubuntu.com/questions/196212/how-do-you-open-a-command-line

-How to setup and use ftp server in ubuntu linux?
https://linuxconfig.org/how-to-setup-and-use-ftp-server-in-ubuntu-linux
https://help.ubuntu.com/lts/serverguide/ftp-server.html
https://th.godaddy.com/help/how-to-set-up-an-ftp-server-on-ubuntu-1404-12301