gdellicarpini

wget -c --header "Cookie: oraclelicense=accept-securebackup-cookie" http://download.oracle.com/otn-pub/java/jdk/8u131-b11/d54c1d3a095b4ff2b6607d096fa80163/jdk-8u131-linux-x64.rpm

sudo yum localinstall jdk-8u131-linux-x64.rpm -y

Aliases for all users

Create a file in /etc/profile.d/ directory
```
  - myAlias.sh
```

Define the alias in the file

  alias gotoserver1="ssh [email protected]"

	source: https://www.cs.colostate.edu/helpdocs/vi.html


	u ctrl+z


	MOVING CURSOR

	0 (zero) move cursor to start of current line (the one with the cursor)
	$ move cursor to end of current line

	on server1 logged as root

	root@server1: sudo su
	root@server1: ssh-keygen -t RSA
	root@server1: cd root/.ssh/

	//append server1's public key to server2's /root/.ssh/authorized_keys file
	root@server1: ssh-copy-id -i id_rsa.pub root@server2

	Now you can log into server2 as root without password.

	On the server target:
	- Create (if not exists) a blank file named "authorized_keys" in /home/<username>/.ssh/

	- Download PuttyGen
	- Open PuttyGen
	- Click on "Generate"
	- Keep mooving mouse on blank area

	Once keys are generated:
	- Copy public key and paste it in the "authorized_keys" file


	cp filename.txt{,.BACKUP} Equals to "cp filename.txt filename.txt.BACKUP"