one condition can cause the same error, each
condition is described in a separate paragraph
under the error code.
USAGE This section lists special rules, features, and
commands that require in-depth explanations. The
subsections listed here are used to explain built-in
functionality:
Commands
Modifiers
Variables
Expressions
Input Grammar
EXAMPLES This section provides examples of usage or of how
to use a command or function. Wherever possible a
complete example including command-line entry
and machine response is shown. Whenever an
example is given, the prompt is shown as
example%, or if the user must be superuser,
example#. Examples are followed by explanations,
variable substitution rules, or returned values. Most
examples illustrate concepts from the SYNOPSIS,
DESCRIPTION, OPTIONS, and USAGE sections.
ENVIRONMENT VARIABLES This section lists any environment variables that
the command or function affects, followed by a
brief description of the effect.
EXIT STATUS This section lists the values the command returns to
the calling program or shell and the conditions that
cause these values to be returned. Usually, zero is
returned for successful completion, and values
other than zero for various error conditions.
FILES This section lists all file names referred to by the
man page, files of interest, and files created or
required by commands. Each is followed by a
descriptive summary or explanation.
ATTRIBUTES This section lists characteristics of commands,
utilities, and device drivers by defining the
attribute type and its corresponding value. See
attributes(5) for more information.
SEE ALSO This section lists references to other man pages,
in-house documentation, and outside publications.
16 man pages section 3: Extended Library Functions • December 2002
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