NL(1) RISC/os Reference Manual NL(1)
NAME
nl - line numbering filter
SYNOPSIS
nl [-btype] [-ftype] [-htype] [-vstart#] [-iincr] [-p]
[-lnum] [-ssep] [-wwidth] [-nformat] [-ddelim] [file]
DESCRIPTION
nl reads lines from the named file, or the standard input if
no file is named, and reproduces the lines on the standard
output. Lines are numbered on the left in accordance with
the command options in effect.
nl views the text it reads in terms of logical pages. Line
numbering is reset at the start of each logical page. A
logical page consists of a header, a body, and a footer sec-
tion. Empty sections are valid. Different line numbering
options are independently available for header, body, and
footer. For example, -bt (the default) numbers non-blank
lines in the body section and does not number any lines in
the header and footer sections.
The start of logical page sections are signaled by input
lines containing nothing but the following delimiter
character(s):
Line contents Start of
\:\:\: header
\:\: body
\: footer
Unless optioned otherwise, nl assumes the text being read is
in a single logical page body.
Command options may appear in any order and may be intermin-
gled with an optional file name. Only one file may be
named. The options are:
-btype Specifies which logical page body lines are to be
numbered. Recognized types and their meanings
are:
a number all lines
t number lines with printable text only
n no line numbering
pexp number only lines that contain the regular expression
specified in exp (see ed(1))
Default type for logical page body is t (text
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NL(1) RISC/os Reference Manual NL(1)
lines numbered).
-ftype Same as -btype except for footer. Default type
for logical page footer is n (no lines numbered).
-htype Same as -btype except for header. Default type
for logical page header is n (no lines numbered).
-vstart# start# is the initial value used to number logical
page lines. Default start# is 1.
-iincr incr is the increment value used to number logical
page lines. Default incr is 1.
-p Do not restart numbering at logical page delim-
iters.
-lnum num is the number of blank lines to be considered
as one. For example, -l2 results in only the
second adjacent blank being numbered (if the
appropriate -ha, -ba, and/or -fa option is set).
Default num is 1.
-ssep sep is the character(s) used in separating the
line number and the corresponding text line.
Default sep is a tab.
-wwidth width is the number of characters to be used for
the line number. Default width is 6.
-nformat format is the line numbering format. Recognized
values are: ln, left justified, leading zeroes
suppressed; rn, right justified, leading zeroes
suppressed; rz, right justified, leading zeroes
kept. Default format is rn (right justified).
-ddelim The two delimiter characters specifying the start
of a logical page section may be changed from the
default characters (\:) to two user-specified
characters. If only one character is entered, the
second character remains the default character
(:). No space should appear between the -d and
the delimiter characters. To enter a backslash,
use two backslashes.
INTERNATIONAL FUNCTIONALITY
nl can process files containing characters from supplemen-
tary code sets. Searches are performed on characters, not
on bytes.
Options:
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-ssep
Characters used for sep and del must be single-byte
characters.
-ddel
Characters used for sep and del must be single-byte
characters.
-bt All characters from supplementary code sets are con-
sidered printable.
-ht All characters from supplementary code sets are con-
sidered printable.
EXAMPLE
The command:
nl -v10 -i10 -d!+ file1
will cause the first line of the page body to be numbered
10, the second line of the page body to be numbered 20, the
third 30, and so forth. The logical page delimiters are !+.
SEE ALSO
pr(1), ed(1).
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