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Full Discussion: Inserting a line when its length is variable
Top Forums Shell Programming and Scripting Inserting a line when its length is variable Post 302361016 by nxp on Monday 12th of October 2009 01:47:19 AM
Old 10-12-2009
Inserting a line when its length is variable
Hi Unix experts

I have simple text files in which the number of lines vary from one file to another. They look like the following:
Code:
#
#
.
.
 34    46 
 76    72
 39    68

I want to grab the first number of the last line of each file (let's say A= 39 in the above example), which is always a multiplication of 3, and insert a new line in the 28th line of another text file with the following format:


0, (A/3) +1, 0, 3,6,9,12,15,...,A

Where A can be a number between 3 and 54, so the number of fields in the line would be variable. Positions of zeros(0) in the line remain fixed. In case of A=39 the line lools like:

0, 14, 0,3,6,9,12,15,18,21,24,27,30,33,36,39

Any help is very much appreciated.

Regards
 

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LEARN ABOUT X11R4

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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