Adyar Banyan Tree

Adyar Banyan tree is consider one of the larget and oldest tree in the world. It's 450-year old gaint tree located in the grounds of the Theosophical Society headquarters, known locally as Adyar aala maram, whose aerial roots cover some 60,000 sq m. Which people listened to discourses by luminaries suc as J. Krishnamurti, Annie Besant and Maria Montessori.

Adyar Banyan Tree

Theosophical Society garden lies on the south bank of the Adyar River and covers 260 acres. The garden has migratory birds, fruit bats, snakes, jackals, wild cats, mongooses, hares and a variety of spiders. Trees include the rare mahogany and other trees from across the globe. 

Adyar Banyan Tree

The Theosophy Society - Adyar is the name of a section of the Theosophical Society founded by Helena Petrovna Blavatsky and others in 1875. Its headquarters moved with Blavatsky and president Henry Steel Olcott to Adyar, an area of Chennai in 1883.

TheosphicalSociety by Balavatsky in 1908

The designation 'Adyar' is added to make it clear that this is the Theosophical Society headquartered there, after William Quan Judge was separated by Besant and formed his own organization, known as the "Theosophical Society - Pasadena", with its International Headquarters in Pasadena, California.

Adyar Banyan Tree

This banyan tree appears to be 40 foot tall, 30 tonne trunk.  At a time some 3000 people can stay under its shade. There are times when people gathered and listened to great philosophers speech. During 1989, this banyan tree  was hit by a cyclone and uprooted.  Inorder to save this renowned tree huge cranes were used to put it in place.  Now it is still surviving by extending its trunks and holding its fame till today.

Tags: Adyar, Banyan-tree, Chennai, Balavatsky

Copy files using scp from one system to remote system

Linux administrator should be familiar with CLI environment. Since GUI mode in Linux servers is not a common to be installed. SSH may the most popular protocol to enable Linux administrator to manage the servers via remote in secure way. Built-in with SSH command there is SCP command. SCP is used to copy file(s) between servers in secure way.

scp stands for secure cp (copy), which means you can copy files across ssh connection. That connection will be securely encrypted, it is a very secure way to copy files between computers. scp uses by default the port 22, and connect via an encrypted connection or secure shell connection. (ssh for short).


scp [-12346BCEpqrv] [-c cipher] [-F ssh_config] [-i identity_file] [-l limit] [-o ssh_option] [-P port] [-S program] [[user@]host1:]file1 ... [[user@]host2:]file2


Copy one single local file to a remote destination

scp /path/to/source-file user@host:/path/to/destination-folder/
scp user@host:/path/to/source-file /path/to/destination-folder

Command copy's local fource file to remote system /path/to/destination-folder/ folder and also vice versa.

Copy one single file from a remote server to another remote server

scp user1@server1:/path/to/file user2@server2:/path/to/folder/

above command copy a file from one server to another server. This command is executed from thrid server.

Copy multiple files with one command

scp file1.txt file2.txt file3.txt

Copies multiple files with file name mentioned, to another server named

Copy all files with wildcard

scp /path/to/folder/*.ext user@server:/path/to/folder/

Command copies list of file with extension .txt with in a folder.

Copy all files in a folder recursively to a remote server

scp -r /path/to/source-folder user@server:/path/to/destination-folder/

Command copies all files and folders with-in source-folder recursively to remote server with same folder structure.

For more scp command options use man page using below man command.

man scp


Tags: SCP, Remote Copy, SSH

Run command on remote server via ssh

If you need to run a command or shell script on a remote server via ssh


ssh <username>@<hostname> '<commands>'
             ssh command uses three mandatory input, 
             username = username to login to remote system
             hostname = Remote system name or ip address
             commands = single command or list of commands seperated by semicolon

Command will login to remote system with the provided username and password and executes the listed command and retrives the return data and shows in terminal or you can redirected to a file using redirect sysmbol.

Instead of execute a command, you can also execute a shell script or any executable remotely.


ssh user@system1 'ls -l'

above command will execute the ls command in home folder of the user and returns a long list of file lists available.

ssh user@system 'pwd; ls; whoami'

above command will execute the commands one by one. 

pwd - current directory - home directory of the logged user, ls - list files in home directory, whoami - shows the current logged in user name.

Executing a remote shell script or a executable

ssh -t user@remotesystem 'sudo service mysql restart'

To start or to stop a service or executable with sudo user access we need to use -t option to Force pseudo-terminal allocation.

-t      Force pseudo-terminal allocation.  This can be used to execute arbitrary screen-based programs on a remote machine, which can be very useful,

e.g. when implementing menu services.  Multiple -t options force tty allocation, even if ssh has no local tty.


Tags: SSH, Remote Command