nl(1)
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nl Command
line numbering filter
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SYNTAX
nl [-htype] [-btype] [-ftype] [-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 section. Empty
sections are valid. Different line numbering options are
independently available for header, body, and footer (e.g., no
numbering of header and footer lines while numbering blank lines
only in the body).
The start of logical page sections are signaled by input lines
containing only 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 intermingled
with only one optional filename. The options are:
-btype Specifies which logical page body lines are to be
numbered. Recognized types and their meaning are:
a number all lines
t number lines with printable text only
n no line numbering
pstringnumber only lines that contain the regular expression
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nl(1)
specified in string.
Default type for logical page body is t (text lines
numbered).
-htype Same as -btype except for header. Default type for
logical page header is n (no lines numbered).
-ftype Same as -btype, but default for logical page footer is
n (no lines numbered).
-p Do not restart numbering at logical page delimiters.
-vstart# Start# is the initial value used to number logical page
lines. Default is 1.
-iincr Incr is the increment value used to number logical page
lines. Default 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 supressed;
rz right justified, leading zeroes kept.
Default format is rn (right justified).
-lnum Num is the number of blank lines to be considered as
one line. For example, -l2 numbers only the second
adjacent blank (if the appropriate -ha, -ba, and/or -fa
option is set). Default is 1.
-dxx The 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.
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nl(1)
EXAMPLES
$ cat oldfile
Cari Goldsmith:
Mill Valley, CA
Bella Anderson:
Los Altos, CA
Susan Walton:
Cleveland, OH
$ nl -bp: oldfile >newfile
$ cat newfile
1Cari Goldsmith:
Mill Valley, CA
2Bella Anderson:
Los Altos, CA
3Susan Walton:
Cleveland, OH
$
This example inserts line numbers on all lines in the input file
that contain a colon.
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SEE ALSO
pr(1).
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