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scp command

I've already outlined the detailed steps for migrating users, home directories and email to a new Linux server. I received a couple of emails asking about migrating printer configuration. From my mail bag:

Is it possible to migrate the printer configuration from one machine to another, just like user migration?

Yes, it is possible since Linux uses CUPS i.e. the common unix printing system. It is a modular printing system for Unix-like computer operating systems that allows a computer to act as a print server. A computer running CUPS is a host that can accept print jobs from client computers, process them, and send them to the appropriate printer.

Migrate Linux Printer Configuration

CUPS stores its configuration at /etc/cups directory, so all you have to do is copy /etc/cups to a new computer. Open terminal and type the commands on old Linux computer:
# tar -cvzf /tmp/cups-$(hostname).tar.gz /etc/cups
Copy /tmp/cups* to new system using SCP or use USB pen driver:
# scp /tmp/cups* new.linux.server.com:/tmp

Now login to new system and type the following commands:
# mv /etc/cups /etc/cups.backup
# cd /
# tar -zcvf /tmp/cups*

Finally, restart the cups service:
# /etc/init.d/cupsys restart

Recently a friend of mine, brought a new Laptop. He installed Red Hat Enterrpise Linux workstation 4.0. However, after installation he realized that he lost all his Mozilla thunderbird emails and Firefox bookmarks, chat client logs and other files.

I told him just copy all old files from /home/$you to a new system /home/$you directory. He was trying some age-old tutorial from net, which explains how to copy files using tar and restore it back to new system. During this procedure, he was messing up with file system permissions.
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The SSH protocol is recommended for remote login and remote file transfer which provides confidentiality and security for data exchanged between two computer systems, through the use of public key cryptography. The OpenSSH server provides this kind of setup under Linux. It is installed by default. This how-to covers generating and using ssh keys for automated usage such as:

  1. Automated Login using the shell scripts.
  2. Making backups.
  3. Run commands from the shell prompt etc.

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