APLawrence.com -  Resources for Unix and Linux Systems, Bloggers and the self-employed
RSS Feeds RSS Feeds









Return to Index

January 2000

Custom 404 Pages 
- Often people come to your web site with an incorrect URL. To show that, let's try a deliberate error on my site
 
NETTEST  by Shade Tree Software Inc
- Kevin Smith of Shade Tree Software, Inc. is a frequent contributor to the SCO newsgroups. Here he provides a small utility to exercise and test network ports.
 
Booting SCO_OSR5- Filesystems 
- Just about anything you are going to do with a computer involves files. Unix in general treats just about everything as a file: devices, directories, named pipes- they are all just files. Other OS's don't necessarily do that; for example there's no visible /dev directory on a Windows system-though if you are programming in "C", for example, you can open "/dev/lp" and print to it just as you would in Unix! Besides that, though Windows doesn't usually let you have direct access to its devices: a tape backup program, for example, knows how to write to your tape drive, but you'd have no way to directly access it yourself as you do in Unix. The concept of "everything is a file" is one of the distinguishing characteristics of Unix systems. Files are created on filesystems, filesystems are created on divisions (SCO's terminology) and divisions are created within partitions.
 
Netscape Communicator 4.7 
- If you use Netscape as your browser under SCO Unix, you've probably been annoyed at how far behind you are in terms of versions.
 
LDAP Basics 
- If you are running Linux, LDAP is almost certainly installed. SCO's OSR5 products don't include LDAP. However, Skunkware does have an OSR5 LDAP server, and you can install it and learn LDAP basics in literally just a few minutes: LDAP is not at all difficult, and anyone capable of basic scripting can understand it and use it.
 
Digiboard Port Server 
- Digiboard PortServers are excellent ways to convert older serial devices to TCP/IP.
 
Unix passwd to LDAP Script 
- This is a simple program that reads the Unix /etc/passwd and updates a LDAP server. See LDAP Basics for an introduction to LDAP.
 
Use and Abuse of /usr/local/bin 
- It starts when some poor soul has written a script to do some thing or another, and happens to mention that it was called "/usr/bin/whatever". Of course the hapless poster usually had no real reason to mention its path, that was just an accident, or it appeared in some other script that was being posted for examination. No matter, the damage is done, for immediately some defender of the faith is going to chide the poster and sanctimoniously inform them that the proper place for home grown scripts is /usr/local/bin. In some cases, that's all the poor person gets: whatever the question originally was is forgotten and only the placement issue is discussed.
 
Cron At and Batch 
- Cron, Batch and At, including explanations of why it might not be working and why you shouldn't use crontab -e