Step 1:

In some webhosting plans it's possible to access your data via SSH. The following commands are available:

 

Files and folders
cat, tac, less, more	Output of a file content	cat <file>
cd	Switches the directory	cd <directory>
chmod	Changes privileges of files/folders	chmod -R 777 <directory>
cmp, diff	Comparison of two files	cmp <file1> <file2>
cp	Copies files/folders	cp <file1> <file2>
csplit, split	Splits files
cut	Cuts columns or fields from files
dir	Alias for ls -a1h	dir
du	Evaluates the storage footprint of files/folders	du --max-depth=1 -h
grep, egrep, fgrep	Searches in files	grep -i <text> <file>
file	Determines the file type	file -i <file>
find	Searches for files	find -name "<file>"
head	Output of the initial lines of a file	head <file>
join	Merges files	join <file1> <file2>
ln	Creates a link pointing to a file/folder	ln -s <ziel> <name>
ls	Lists files/folders	ls -al
ll	Alias for ls -al	ll
la	Alias for ls -A	la
l	Alias for ls -alF	l
mc	Midnight Commander	mc
md5sum, sha1sum, sum	Determines the checksum of a file	md5sum <file>
mkdir	Creates a new folder	mkdir <directory>
mv	Renames/moves files/folders	mv <file1> <file2>
nl	Displays the content of a file with line numbers	nl <file>
patch	Shows changes to a file on the basis of a diff file	patch < patch.diff
pwd	Shows the current folder	pwd
rename	Renames files	rename 's/<text1>/<text2>/g' *
rm	Deletes files/folders	rm <file>
rmdir	Deletes an empty folder	rmdir <directory>
sort	Assorts the content of a file	sort <file> > <file_sortiert>
tail	Output of a file content from a certain line on	tail -n 3 <file>
touch	Changes the time stamp of a file	touch <file>
unlink	Deletes files	unlink <file>
wc	Displays the number of lines, terms and characters in a file	wc <file>
Compressing and archiving
bzcat, bzless, bzmore	Output of the content of bzip2 archives	bzcat <file>
bzcmp, bzdiff	Compares the the content of bzip2 archives	bzcmp <file1> <file2>
bzegrep, bzfgrep, bzgrep	Browses files inside bzip2 archives	bzegrep <text> <file>
bzip2, bunzip2	Packs/unpacks files using bzip2	bunzip2 <file>
bzip2recover	Restores defective bzip2 archives	bzip2recover <file>
gzip, gunzip	Packs/unpacks files using gzip	gunzip <file>
tar	Archives files and folders	tar cfvz backup.tar.gz <directory>
zcat, zless, zmore	Shows the content of gzip archives	zcat <file>
zcmp, zdiff	Compares the the content of gzip archives	zcmp <file1> <file2>
zegrep, zfgrep, zgrep	Browses files inside gzip archives	zegrep <text> <file>
zip, unzip	Packs/unpacks files using zip	unzip <file>
Editors
joe, mcedit, vim/vi, nano	Edits files	mcedit <file>
sed, awk, gawk	Transforms strings
Network
curl	Transmits files	curl <url>
dig, nslookup	DNS server query
ftp	Establishes an FTP connection	ftp <hostname>
rsync	Aligns data between source and target	rsync <quelle> <ziel>
scp	Securely transmits files via the network	scp <user>@<hostname>
sftp	Establishes an SFTP connection	sftp <hostname>
ssh	Establishes a secure connection to another client	ssh <user>@<hostname>
wget	Downloads files via HTTP/FTP	wget <hostname>/<file>
Scripting languages
php	PHP Interpreter	php <file>
composer	Dependency Manager for PHP	composer
pear	Pear
perl	Perl	perl <file>
python, python2, python3	Python	python <file>
pip	package installer for Python	pip install <modul>
MySQL
mysqldump	Creates a database dump	mysqldump -u LOGIN -p'PASSWORT'  LOGIN > dumpDATUM.sql
mysql	Establishes a database connection, e.g. in order to restore a database backup	mysql -u LOGIN -p'PASSWORT' LOGIN < dumpDATUM.sql
Version Control
bzr
git
svn	Subversion Client
Terminal, Shell, Background processes
<	Input redirection	<command> < <file>
>	Redirects the output into a file	<command> > <file>
>>	Attaches the output to a file	<command> >> <file>
|	Output redirection	find | grep <file>
source	Reads and executes commands from a file	source <file>
&	Initiates background processes	<command> &
2>	Redirects the error output	<command> 2> <file>
alias	Sets a shortcut for a command	alias ll='ls -al'
bg	Continues background processes
clear	Clears the screen content	clear
export	Exports environment variables	export <var>
fg	Continues foreground processes
hash	Displays the path names of already executed commands	hash
history	Displays the already executed commands	history
jobs	Lists halted background processes
printenv, set	Displays/changes environment variables
pv	Monitors the progression of a task
reset	Restores the terminal character set	reset
sleep	Puts a process to sleep
[Strg] + c	Aborts the current process in the shell ab
[Strg] + z	Halts the current process in the shell
stty	Queries/changes terminal settings
unalias	Deletes the alias of a command	unalias ll
watch	Periodically executes the command and shows output
Miscellaneous
date	Displays date and time	date
echo	Output of text	echo "Hello World!"
exit	Terminates the current session	exit
expand	Converts tabs into spaces	expand <file>
expr	Performs calculations	expr 1 + 1
groups	Displays the groups of the current user	groups
hostname	Displays the own hostname	hostname
iconv, recode	Converts character sets
id	Displays the own username/group name	id
kill	Send signals to processes, e.g. in order to terminate them
time	Performs time measurements of processes	time <command>
tr	Replaces characters
uname	Displays system informations	uname -a
unexpand	Converts spaces into tabs	unexpand <file>
uniq	One-time output of identical, batched lines
whoami	Displays the own login name	whoami