MPE/iX Shell and Utilities Reference Manual, Vol 1

intro(1) MPE/iX Shell and Utilities intro(1)
are the regerror(3) man page which describes all the errors that occur while processing
regular expressions, the rcserror(3) man page which describes errors that are common to
most RCS utilities and the syserror(3) man page which describes system errors that are pro-
duced by the operating system.
Portability
The PORTABILITY section includes two types of information:
• Availability of a version of the command on existing UNIX

systems (System V, BSD).
• Compatibility with industry standards (for example, the POSIX.2 Standard or the x/OPEN
Portability Guide, Issue 4).
Limits
The LIMITS section lists any limits on the operation of the software. For example, the dc(1)
command is intended to work like a desk calculator that can handle numbers of any size.
However, at the time of this writing, it actually has a limit of 1000 digits when typing in a
single number. Limits of this sort are inevitable when writing software, but when designing
MPE/iX Shell and Utilities, we did our best to set the limits high enough that they will not get
in the way of our users.
Some limits are implicit rather than explicit, and may be lower than the explicitly stated limit.
Warning
The WARNING section contains important advice for users. In MPE/iX Shell and Utilities doc-
umentation, the WARNING section is often aimed at those who are familiar with
UNIX systems.
Since MPE/iX Shell and Utilities complies, first and foremost, to the
POSIX standards, and
resides on a proprietary platform, its behavior may not precisely match the corresponding
UNIX commands. The WARNING section may point out discrepancies in behavior that may
catch experienced POSIX or UNIX users by surprise.
Notes
The NOTES section gives additional notes for those using the software. The purpose of the
NOTES section is similar to that of the WARNING section — to provide important information
that the reader should not overlook; however, NOTES usually deal with issues that are more
benign than WARNINGS.
MPE/iX Notes
The MPE/iX NOTES section lists information that applies only to the MPE/iX version of this
software. Since the current release of MPE/iX is not fully POSIX.1 compliant, it places a number
of limitations on the MPE/iX Shell and Utilities software. The limitations on a given utility are
listed in the MPE/iX NOTES section of that utility’s man page.
1-6 Commands and Utilities