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ssh
secure shell
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runs on port 22
presentation at Linux Meetup Tue 18 Nov 2008 06:09:42 PM CST 
by Bob Carnaghi http://linux.meetup.com/85/
http://www.webpointmorpheus.com
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GENERAL SSH CONNECTIONS
ssh www.webserver.com
ssh 12.34.56.78
will login as current user on client machine and prompt for password

ssh any_user@www.webserver.com
ssh any_user@12.34.56.78
will prompt for password

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SSH CONNECTION WITHOUT PASSWORD PROMPT
assumed: logging in to computer2 as user2 from computer1 (user1)
1. create an authentication key while logged in to computer1:
	$ ssh-keygen -t dsa
	(accept the default location for saving the key - press ENTER)
	(do not create a passphrase, press ENTER)
	(the key will be saved in the user1/.ssh folder)
	(check that folder for an id_dsa.pub - public - key)
2. transfer the PUBLIC key to computer2
	$ ssh-copy-id -i ~/.ssh/id_dsa.pub user2@computer2
3. login from user1@computer1: ssh user2@computer2
	(should not be prompted for password)


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SFTP
ftp over the ssh channel
sftp user2@computer2

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COMMANDS
cd		change directory on the remote machine
exit, quit	exit the connection
get		copy the specified file to the local machine
help		get help on commands
lcd		change directories on the local machine
lls		list files on the local machine
ls		list files on the remote machine
put		send a file to the remote machine
rm		delete (remove) file from the remote machine


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BACKUP (TAR) OVER SSH
tar cvzf - /directory-on-local-machine | ssh user2@computer2 "cat > backup.tgz"

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forward X11 over ssh
-- on the remote machine, in the sshd_config file, X11Forwarding = yes

ssh -X remote_machine
	(will ssh into the remote machine, X traffic will be passed on the connection)

(on local machine)	
xeyes &
	(xeyes will be displayed on local desktop, but comes from remote machine)

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RSYNC OVER SSH
rsync -ave ssh user2@computer2:directory2/ /computer1/directory1/

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REFERENCES
SSH, The Secure Shell: The Definitive Guide [ILLUSTRATED] (Paperback)
Publisher: O'Reilly Media, Inc.; 2 edition (May 10, 2005)
ISBN-10: 0596008953

http://www.openssh.com/ - open source
http://www.ssh.com/ - commercial 
http://www.employees.org/~satch/ssh/faq/ - ssh faq, lots of info

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