This article is from the Apple II GNO FAQ, by Devin Reade with numerous contributions by others.
A#7.5: There are two common sources of problems. The first is due to improper syntax in the inittab file. See the inittab(5) and initd(8) manual pages for the correct syntax. The second common problem is not due to the inittab file, but rather because the command you are trying to invoke is being invoked incorrectly. The way to check if this is the case is to run the command interactively and see what diagnostic messages appear. You should also check the system log files for messages (see syslogd(8)).
 
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