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When prompted for a password, you can simply press Return. This will create files id_rsa and id_rsa.pub in the directory .ssh under your home directory. If you copy (or append) the file id_rsa.pub (the public key) to the file .ssh/authorized_keys2 under your home directory on the remote machine, you will be able to log in simply by typing ssh faraway.
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Backing Up, Restoring, and Archiving Files
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After you ve done any real work on your SUSE system, you want to make sure that you ve backed it up somewhere in case of hardware failure or accidental deletion of your data. Linux provides a variety of ways to create archive files that contain files and directories. You can then copy these archive files to another machine over your network or write them to removable media such as a CD-ROM to protect yourself against calamities. This section introduces some of the most popular commands used to create archive files on a Linux system, either as a standard Linux archive file or as an ISO file that you can subsequently burn to a CD for archival purposes.
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Creating and reading simple archives
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We mentioned gzipped tar archives earlier if you want to back up the current state of a directory with all file permissions, date stamps, and symbolic links preserved, creating such an archive may be the best way to do it. To create a gzipped tar archive of the directory work, execute a command such as the following:
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tar zcvf work.tgz work/
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Part I SUSE Linux Basics
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The options zcvf mean compressed, create, verbose, file, respectively. If you copy the archive somewhere else and you want to unpack it:
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tar zxvf work.tgz
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where zxvf means compressed, extract, verbose, file. If your aim was simply to back up the directory on a remote machine, you can create the file on your local machine and copy it elsewhere as explained in the previous section. You could also use ssh and tar together to copy the directory tree across, like this:
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tar cvf - work/|ssh faraway cd /home/bible/incoming; tar xvf -
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What this does is to create a tar archive of the directory work on standard output, which is pushed through the pipe (|) to ssh, which changes directory and unpacks the archive that it is receiving on standard input. SUSE includes a very nice tool called pax that can both create archives and very easily move a directory tree from one place to another, preserving all file attributes. To create a pax archive of the directory work, you can do this:
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pax -wf work.pax work/
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To unpack this again, do the following:
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pax -rvf work.pax
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One of the nice features of pax is that it can deal with archives in both the traditional Unix formats tar and cpio. It is also a very convenient tool for copying a directory tree unchanged from one place to another, like this:
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pax rwv work /tmp/
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Creating an ISO image to burn to CD
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An ISO file is a file that essentially contains the image of an ISO 9660 compliant CD. If you create archive files in this format, you can then burn those files to a CD for offsite archival purposes. To create an ISO image of the directory work that you can subsequently burn to CD, do this:
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mkisofs -J -r -o work.iso work/
To mount the image and check that it is correct, use the following:
mount work.iso /mnt o loop
You can then umount the image (umount /mnt) and then burn the image to CD using cdrecord from the command line or KDE s k3b tool. Ultimately, this chapter has attempted to introduce the most common commands and concepts that you will need when working with a SUSE Linux system. Much of the material that has been covered here will become clearer as it is used again in other chapters of the book. It is often said that the only way to learn a language is to use it. In the same way, if the commands and ideas in this chapter were new to you, the best advice is to use them, experiment with them, and gain knowledge by experience, with the examples here as a guide.