This article is from a FAQ concerning SCO operating systems. While some of the information may be applicable to any OS, or any Unix or Linux OS, it may be specific to SCO Xenix, Open There is lots of Linux, Mac OS X and general Unix info elsewhere on this site: Search this site is the best way to find anything.
This is an ancient post with no relevance to modern systems.
You can check gettydefs using /etc/getty -c /etc/gettydefs; this command will print out everything you could possibly want to know, and then some. Common mistakes include not leaving a blank line between entries or having a cycle of settings but forgetting to close the loop (e.g. if 1 fails, use 2; if 2 fails, use 3; if 3 fails, you forgot to tell it to go back to 1).
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What do such machines really do? They increase the number of things we can do without thinking. Things we do without thinking — there's the real danger. (Frank Herbert)