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Full Discussion: how to insert a line number on every line
Top Forums UNIX for Dummies Questions & Answers how to insert a line number on every line Post 302069418 by Perderabo on Saturday 25th of March 2006 11:04:24 AM
Old 03-25-2006
Thanks for posting your solution. It is an interesting approach. Another way is to use the nl command. nl numbers lines for a living. Just doing "nl file3" won't exactly replicate the result you got with your sed processes though. First, by default, nl ignores blank lines and only numbers lines with text on them. But a "-ba" option will fix that. The next problem is that nl keeps the line number right justified inside a field that is 6 characters wide. I like that feature, although 6 is a bit much. To emulate your result of not aligning the line numbers we can set the field width to 1. And finally, nl puts a tab after the line number, and we need to change that to a right parenthesis. So:
nl -ba -w1 -s\) file3
will do what you want. There are also a lot of other options to control the output.
 

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LEARN ABOUT MINIX

nl

NL(1)								   User Commands							     NL(1)

NAME

       nl - number lines of files

SYNOPSIS

       nl [OPTION]... [FILE]...

DESCRIPTION

       Write each FILE to standard output, with line numbers added.

       With no FILE, or when FILE is -, read standard input.

       Mandatory arguments to long options are mandatory for short options too.

       -b, --body-numbering=STYLE
	      use STYLE for numbering body lines

       -d, --section-delimiter=CC
	      use CC for logical page delimiters

       -f, --footer-numbering=STYLE
	      use STYLE for numbering footer lines

       -h, --header-numbering=STYLE
	      use STYLE for numbering header lines

       -i, --line-increment=NUMBER
	      line number increment at each line

       -l, --join-blank-lines=NUMBER
	      group of NUMBER empty lines counted as one

       -n, --number-format=FORMAT
	      insert line numbers according to FORMAT

       -p, --no-renumber
	      do not reset line numbers for each section

       -s, --number-separator=STRING
	      add STRING after (possible) line number

       -v, --starting-line-number=NUMBER
	      first line number for each section

       -w, --number-width=NUMBER
	      use NUMBER columns for line numbers

       --help display this help and exit

       --version
	      output version information and exit

       By  default,  selects -v1 -i1 -l1 -sTAB -w6 -nrn -hn -bt -fn.  CC are two delimiter characters used to construct logical page delimiters, a
       missing second character implies :.  Type \ for .  STYLE is one of:

       a      number all lines

       t      number only nonempty lines

       n      number no lines

       pBRE   number only lines that contain a match for the basic regular expression, BRE

       FORMAT is one of:

       ln     left justified, no leading zeros

       rn     right justified, no leading zeros

       rz     right justified, leading zeros

AUTHOR

       Written by Scott Bartram and David MacKenzie.

REPORTING BUGS

       GNU coreutils online help: <http://www.gnu.org/software/coreutils/>
       Report nl translation bugs to <http://translationproject.org/team/>

COPYRIGHT

       Copyright (C) 2017 Free Software Foundation, Inc.  License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>.
       This is free software: you are free to change and redistribute it.  There is NO WARRANTY, to the extent permitted by law.

SEE ALSO

       Full documentation at: <http://www.gnu.org/software/coreutils/nl>
       or available locally via: info '(coreutils) nl invocation'

GNU coreutils 8.28						   January 2018 							     NL(1)
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