Rsync Linux Commands: 

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Q. What is RSYNC and how to use it to Synchronize files in Linux servers?
- rsync is a powerful and versatile Linux command for transferring and synchronizing files between local and remote servers.  This approach reduces bandwidth usage and speeds up transfers.

Objective: To Synchronize file files on the Remote server in such a way that we are not required to copy them one by one. Easy access and less effort to copy and paste remotely.

# Dependencies are
-ssh 
-Local and remote machines should have rsync installed

# Sonfigure ssh SH ssh key no password
$ ssh-keygen (hit enter to set no password)
$ ssh-copy-id -i ~/.ssh/id_rsa.pub userForKali@IPaddressForKali

# Create a config folder in .ssh
$ touch ~/.ssh/config
$ chmod u=--- ~/.ssh/config
$ chmod u=rw- ~/.ssh/config

# Paste these in the config file
host nameanything
hostname 192.168.1.40
port 22
user devil
IdentityFile ~/.ssh/id_rsa

# Edit file /etc/ssh/sshd_config and add two lines at the end of the file
PubkeyAuthentication yes
PasswordAuthentication no

# Basic Syntax of rsync
rsync [OPTIONS] SOURCE DESTINATION

# List the files in the local machine using rsync
$ rsync files_directory_name

# List the files in a remote machine
$ rsync devil@192.168.1.40:~/devil/files

# Sync a directory to another directory or location in a local machine only
-a: Archive mode
-v: Verbose mode
-h: Human-readable output
rsync -avh localfolder localfolder2 

# Copy files (demo mode, it will check for errors)
$ rsync --dry-run files devil@192.168.1.40:~/home

# Copy files (demo mode, it will check for errors) 
-r recursively
-v verbose
$ rsync -rv --dry-run files devil@192.168.1.40:~/devil

# copy without dry-run
$ rsync -rv files devil@192.168.1.40:~/devil

# Delete everything from your computer 
rm files/*

# Copy from a remote server to the local system
$ rsync -rv devil@192.168.1.40:~/devil/files/ files/

# Rename the file into local machine and sync again, it will keep both of the files by default
$ rsync -rv --dry-run files devil@192.168.1.40:~/devil

# Delete all the old files from the remote server and copy new files
$ rsync -rv --delete files devil@192.168.1.40:~/devil

# Check the files ls -l time has been modified on a remote server 
# Time sync keep same time using 
-a - archive mode
$ rsync -rva --delete files devil@192.168.1.40:~/devil

# Copy the files from the local to the remote server but
# Delete the files from the local machine once its sent
$ rsync -rva --remove-source-files files devil@192.168.1.40:~/devil

[ BONUS COMMANDS ]
How to connect to termux shell using SSH

# Install ssh
$ pkg install openssh

# Change password
$ passwd

# Start ssh in termux
$ sshd
# copy the username
whomi

# Come to kali shell or ubuntu
$ ssh -p 8022 u0_a245@10.5.1.19