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NL(1)                     BSD General Commands Manual                    NL(1)

NAME
     nl -- line numbering filter

SYNOPSIS
     nl [-p] [-b type] [-d delim] [-f type] [-h type] [-i incr] [-l num] [-n format] [-s sep] [-v startnum]
        [-w width] [file]

DESCRIPTION
     The nl utility reads lines from the named file or the standard input if the file argument is ommitted,
     applies a configurable line numbering filter operation and writes the result to the standard output.

     The nl utility treats the text it reads in terms of logical pages.  Unless specified otherwise, 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 avail-able available
     able for header, body and footer sections.

     The starts of logical page sections are signalled by input lines containing nothing but one of the fol-lowing following
     lowing sequences of delimiter characters:

           Line      Start of
           \:\:\:    header
           \:\:      body
           \:        footer

     If the input does not contain any logical page section signalling directives, the text being read is
     assumed to consist of a single logical page body.

     The following options are available:

     -b type      Specify the logical page body lines to be numbered.  Recognized type arguments are:

                  a       Number all lines.

                  t       Number only non-empty lines.

                  n       No line numbering.

                  pexpr   Number only those lines that contain the basic regular expression specified by
                          expr.

                  The default type for logical page body lines is t.

     -d delim     Specify the delimiter characters used to indicate the start of a logical page section in
                  the input file.  At most two characters may be specified; if only one character is speci-fied, specified,
                  fied, the first character is replaced and the second character remains unchanged.  The
                  default delim characters are ``\:''.

     -f type      Specify the same as -b type except for logical page footer lines.  The default type for
                  logical page footer lines is n.

     -h type      Specify the same as -b type except for logical page header lines.  The default type for
                  logical page header lines is n.

     -i incr      Specify the increment value used to number logical page lines.  The default incr value is
                  1.

     -l num       If numbering of all lines is specified for the current logical section using the corre-sponding corresponding
                  sponding -b a, -f a or -h a option, specify the number of adjacent blank lines to be con-sidered considered
                  sidered as one.  For example, -l 2 results in only the second adjacent blank line being
                  numbered.  The default num value is 1.

     -n format    Specify the line numbering output format.  Recognized format arguments are:
                  ln      Left justified.
                  rn      Right justified, leading zeros suppressed.
                  rz      Right justified, leading zeros kept.

                  The default format is rn.

     -p           Specify that line numbering should not be restarted at logical page delimiters.

     -s sep       Specify the characters used in separating the line number and the corresponding text line.
                  The default sep setting is a single tab character.

     -v startnum  Specify the initial value used to number logical page lines; see also the description of
                  the -p option.  The default startnum value is 1.

     -w width     Specify the number of characters to be occupied by the line number; in case the width is
                  insufficient to hold the line number, it will be truncated to its width least significant
                  digits.  The default width is 6.

ENVIRONMENT
     The LANG, LC_ALL, LC_CTYPE and LC_COLLATE environment variables affect the execution of nl as described
     in environ(7).

EXIT STATUS
     The nl utility exits 0 on success, and >0 if an error occurs.

SEE ALSO
     jot(1), pr(1)

STANDARDS
     The nl utility conforms to IEEE Std 1003.1-2001 (``POSIX.1'').

HISTORY
     The nl utility first appeared in AT&T System V Release 2 UNIX.

BUGS
     Input lines are limited to LINE_MAX (2048) bytes in length.

BSD                            January 26, 2005                            BSD