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KEYWORDS=getty, modem, browsers, mozilla, rsync, DAVROM CONSULTING Newsletter - Issue # 22 - Dated: Tue Dec 23 14:17:59 EST 2003


From the desk of David Clark

Merry Christmas to all our readers and many thanks for your continued
support over the years.

We will be open for business as always over the Christmas and New Years
break only closing for Christmas, Boxing and New Years day.

As I always recommend for this time of year, as most staff are away in most
organisations, now would be an ideal time to do those upgrades and changes
to the system. We all know how much people love to hear the server is
going down for a time.... so why not do it when most are away.

I would like to thank the reader for their time in reading this newsletter.

David.M.Clark


UNIX Quote

UNIX/Linux = stability


SCO OpenServer getty binary and modems

Some years back with the release of SCO OpenServer 5.0.4, the getty
binary - the program that controls logins to the system, was modified to
compensate for SCO Merge and modem control on serial ports. SCO Merge is
a product that allows MS Windows to run on the GUI desktop under SCO.

The result that followed, from my experience in the trenches, was that
modem setups that people had used for years to allow remote dialin access
to the system no longer worked. The two main symptoms I had observed were:

- The modem connects but then the connection gets dropped straight away.
- The modem connects and stays connected but you never get the login prompt.

While most people tinkered until they at least had a suitable getty entry
that worked a higher percentage of the time, I actually replaced the
installed getty binary with that of the version that came with SCO
OpenServer 5.0.2. I have even installed the 5.0.2 getty binary on 5.0.7
systems and have had no problems with modem logins. There appears to be no
problems with modems running on the 5.0.2 getty binary and there are no
other issues that I have observed with running the more "spartan", earlier
version on the later OSR servers these last 5-7 years.

If you have modem problems, give it a try.

Browsers under the Linux/UNIX

Some time back I attended a web seminar where the speaker had the opinion
that 80% of users on the web are using MS Internet Explorer and that all
websites should be made compatible with it. Naturally having used
Netscape since the days it first came out, I went and spoke to him
afterwards - I don't think he was even aware that there are other
browsers out there and that there is a vast growing non-Internet Explorer
community on the web in the Linux and Apple communities.

If you are in the area of web development I would highly recommend you
test your web sites with as many browsers as possible. While we don't do
anything too complex at DAVROM on our website, we test our pages with
Mozilla/Netscape, Opera, Konqueror and IE - just to make sure any images
or PHP scripts are working for all possible browsers.

While I mainly use Netscape (and Mozilla), I also use Opera in both Linux
and Windows just as an alternative. Opera comes with its own e-mail
client (POP/IMAP) and it is slightly faster than others I have tried.

Let's make sure the Internet stays the "open" choices community it was
intended to be....


Some News-worthy items

RedHat announce it will discontinue support for RedHat Linux 7.x, 8.0 and
9.0 in favour of offering RedHat Enterprise Linux (commercial product)
and its open source community version of Fedora. For more information
please visit:

http://www.redhat.com/solutions/migration/rhl/

Cyberguard complete their acquisition of SnapGear which is tipped to be a
win/win situation for customers with Cyberguard providing more diverse
range of security products to the market:

http://www.snapgear.com/news20031128.html


Tech Tip


rsync - remote copying files between servers.

Traditionally, I have always used rcp and cpio to transfer files between
servers over a network but I have slowly been switching my scripts over
to use the "rsync" command.

rsync is simple to use and has some distinct advantages over rcp - some
points as per the man page:

- updated protocol to greatly speed up file transfers
- allows transfer just the differences between two sets of files across
the network link
- support for copying links, devices, owners, groups and permissions
- exclude from options similar to GNU tar

The command line is simple if you have two machines that have user
equivalency you can type (as is the case for my Linux desktop when
copying to our SCO server):

rsync /u/david/nsmail/* remserv:/u/david/nsmail

this will copy only those files under my nsmail directory that have
changed or differ from those in the same directory structure on the
remote machine "remserv". Another way is to stipulate a user name and
server name:

rsync -rv scripts/* david@remserv:/u/tmp

and in this case I have asked it to run in both verbose mode (-v) and
recurse down into sub-directories (-r). Example output:

xus
xushelp
yabbadabbadoo
ycprint
wrote 41773 bytes read 30152 bytes 2213.08 bytes/sec
total size is 2223245 speedup is 30.91


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