Notational conventions

The following notational conventions are used to depict commands, options and program directives described in this User Guide:

*STD	Uppercase letters, digits and special characters which do not belong to the metalanguage characters designate keyword or constants which must be entered exactly as shown.
-R msg_id	Uppercase and lowercase letters, digits and special characters in typewritten text are constants and must be entered exactly as shown, except for the -K option arguments, which are shown in the manual in lowercase letters, but may be entered in both uppercase and lowercase (see "Calling syntax and general rules (C/C++ POSIX Commands, #26)").
name	Lowercase letters in italics denote variables, which must be replaced by current values at the time of input.
{cc | c89}	Braces enclose alternatives from which one must be selected. The separator character | must not be specified.
[ ]	Square brackets enclose options that may be omitted.
( )	Parentheses are constants and must be specified.
'BLANK'	This symbol indicates that at least one white space character is necessary for the syntax.
...	Ellipses signify repetition, i.e. the preceding unit can be repeated several times in succession.