useful unix command for beginners to work in remote server

working_in_remote_server.sh

#!/bin/bash
# This gist contains unix command useful for beginners who started working in remote server for their project.
# machine: Ubuntu 16.04

### Connection
# connecting to a remote system using SSH (Secure Shell)
ssh <remote_host>

# for different username on the remote system
ssh <user_name@remote_host>

# adding new user to sudo group
sudo adduser <user_name> sudo

# if X11 forwarding is enabled on both computers, GUI of remote system can be opened on local system
ssh -X <remote_host>

# for opening remote GUI install package "caja"
sudo apt-get install caja
caja

# for connection closed (logout)
exit

### INTERESTING ###
# if you server machine doesn't have any static IP then do the following
# make an account https://www.duckdns.org/
# mahedi.duckdns.org 
# if you don't have ssh then install 
sudo apt-get install openssh-server
ssh <user_name@remote_host>

### Secure Copy
# for secure copying file from your local host to remote server
scp <your_local_file.txt> <user_name@remot_server:/your/remote/directory>

# for secure copying file from remote server to your local host
scp <user_name@remot_server:your_remote_file.txt>  </your/local/directory>


### Working in FTP Server
## (easy_way) using FileZilla
sudo sh -c 'echo "deb http://archive.getdeb.net/ubuntu xenial-getdeb apps" >> /etc/apt/sources.list.d/getdeb.list'

# install the key, to trust Ubuntu that the packages is from
wget -q -O - http://archive.getdeb.net/getdeb-archive.key | sudo apt-key add - repository

# now install ftp clients
sudo apt install filezilla

## (using ftp command) useful when work remotely worked on a server over an SSH session 
# establishing an FTP connection
ftp <domain.com>

# downloading files from FTP server
lcd </your/local/directory>
get <remote_files>

# downloading several files form server (for example: xls files)
mget *.xls

# uploading files with ftp server
put /path/file

# uploading several files on ftp server
mput *.xls

# closing ftp connection
exit

### Handling Large Data
# splitting large file into small parts is useful when the file is too large or upload speed is too slow
# compress the file with tarball archiver
tar -czvf <archive_name.tar.gz> </path/to/folder>

# compress the file with of tar.xz file
tar -xf <archive_name.tar.xz> </path/to/folder>

# split up file archive into small parts (5G).
split -b 5G <archive-name.tar.gz> <"parts-">

# joining files
cat parts-* > folder

### keep processes running on remote server after ending ssh session
# using nohup command
nohup process_running_commnad > filename.txt 2>&1 &
# "2>&1" for standard error writing and last "&" for disown

# for killing nohup 
kill -9 PID