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35 .Nd line numbering filter
73 utility reads lines from the named
75 or the standard input if the
78 applies a configurable line numbering filter operation and writes the result
79 to the standard output.
83 utility treats the text it reads in terms of logical pages.
84 Unless specified otherwise, line numbering is reset at the start of each
86 A logical page consists of a header, a body and a footer
87 section; empty sections are valid.
88 Different line numbering options are
89 independently available for header, body and footer sections.
91 The starts of logical page sections are signalled by input lines containing
92 nothing but one of the following sequences of delimiter characters:
94 .Bl -column "\e:\e:\e:" "Start of" -offset indent
96 .It "\e:\e:\e: header"
101 If the input does not contain any logical page section signalling directives,
102 the text being read is assumed to consist of a single logical page body.
104 The following options are available:
105 .Bl -tag -width ".Fl v Ar startnum"
107 Specify the logical page body lines to be numbered.
111 .Bl -tag -width indent
115 Number only non-empty lines.
119 Number only those lines that contain the basic regular expression specified
126 for logical page body lines is
129 Specify the delimiter characters used to indicate the start of a logical
130 page section in the input file.
131 At most two characters may be specified;
132 if only one character is specified, the first character is replaced and the
133 second character remains unchanged.
141 except for logical page footer lines.
144 for logical page footer lines is
149 except for logical page header lines.
152 for logical page header lines is
155 Specify the increment value used to number logical page lines.
160 If numbering of all lines is specified for the current logical section
161 using the corresponding
167 specify the number of adjacent blank lines to be considered as one.
170 2 results in only the second adjacent blank line being numbered.
175 Specify the line numbering output format.
179 .Bl -tag -width indent -compact
183 Right justified, leading zeros suppressed.
185 Right justified, leading zeros kept.
193 Specify that line numbering should not be restarted at logical page delimiters.
195 Specify the characters used in separating the line number and the corresponding
199 setting is a single tab character.
201 Specify the initial value used to number logical page lines; see also the
209 Specify the number of characters to be occupied by the line number;
212 is insufficient to hold the line number, it will be truncated to its
214 least significant digits.
221 .Ev LANG , LC_ALL , LC_CTYPE
224 environment variables affect the execution of
241 utility first appeared in
244 Input lines are limited to
246 (2048) bytes in length.