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38 .Dd September 20, 2001
43 .Nd line numbering filter
81 utility reads lines from the named
83 or the standard input if the
86 applies a configurable line numbering filter operation and writes the result
87 to the standard output.
91 utility treats the text it reads in terms of logical pages.
92 Unless specified otherwise, line numbering is reset at the start of each
93 logical page. A logical page consists of a header, a body and a footer
94 section; empty sections are valid. Different line numbering options are
95 independently available for header, body and footer sections.
97 The starts of logical page sections are signalled by input lines containing
98 nothing but one of the following sequences of delimiter characters:
100 .Bl -column "\e:\e:\e:" "Start of" -offset indent
102 .It "\e:\e:\e: header"
107 If the input does not contain any logical page section signalling directives,
108 the text being read is assumed to consist of a single logical page body.
110 The following options are available:
111 .Bl -tag -width ".Fl v Ar startnum"
113 Specify the logical page body lines to be numbered.
117 .Bl -tag -width indent
121 Number only non-empty lines.
125 Number only those lines that contain the basic regular expression specified
132 for logical page body lines is
135 Specify the delimiter characters used to indicate the start of a logical
136 page section in the input file. At most two characters may be specified;
137 if only one character is specified, the first character is replaced and the
138 second character remains unchanged.
146 except for logical page footer lines.
149 for logical page footer lines is
154 except for logical page header lines.
157 for logical page header lines is
160 Specify the increment value used to number logical page lines.
165 If numbering of all lines is specified for the current logical section
166 using the corresponding
172 specify the number of adjacent blank lines to be considered as one.
175 2 results in only the second adjacent blank line being numbered.
180 Specify the line numbering output format.
184 .Bl -tag -width indent -compact
188 Right justified, leading zeros suppressed.
190 Right justified, leading zeros kept.
198 Specify that line numbering should not be restarted at logical page delimiters.
200 Specify the characters used in separating the line number and the corresponding
204 setting is a single tab character.
206 Specify the initial value used to number logical page lines; see also the
214 Specify the number of characters to be occupied by the line number;
217 is insufficient to hold the line number, it will be truncated to its
219 least significant digits.
237 utility first appeared in