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Full Discussion: Add markup tag and sequential number after specific line
Top Forums Shell Programming and Scripting Add markup tag and sequential number after specific line Post 302749851 by Corona688 on Saturday 29th of December 2012 04:30:53 PM
Old 12-29-2012
N is an ordinary variable name. X, Q, or SLARTIBARTFAST would also work.

++N is a pre-increment operator -- add one to the variable, then get its value. An unused variable in awk is blank, but blank plus one does the right thing, so it works. If I'd used N++ instead, the first match would be blank instead of 1, since it gets the value and adds after.

In detail:

Code:
# Run the following code block for all things matching the regex
# Print the whole line, the line "> <id>", the variable N plus one, and a newline.
# An extra newline will be added by the print command itself.
# Skip to the next line, since we don't need the current line printed again.
# Print all other lines.
awk '/M END/ { print $0"\n> <id>\n"++N"\n"; next } 1' inputfile > outputfile

 

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LEARN ABOUT DEBIAN

gchem3d

GCHEM3D(1)						       gnome-chemistry-utils							GCHEM3D(1)

NAME

       gchem3d - a small chemical viewer application

SYNOPSIS

       gchem3d [OPTION(S)...] [FILE...]

DESCRIPTION

       gchem3d is a small chemical viewer application, which can show several chemical file formats.

OPTIONS

       The following options are accepted:

       -b COLOR, --bgcolor=COLOR
	   Use the given color as background color.  COLOR can be one of "black" (default), "white", "#rrggbb" (don't forget to escape the "#"
	   character in the shell).

       -d MODEL, --display3d=MODEL
	   Choose how molecules are displayed.	MODEL can be one of "BallnStick" (default), "SpaceFill".

       -?, --help
	   Show application help options.

       --help-all, --help-*
	   Print all or just a group of help options. These options are not documented here. Instead see gtk-options(7) and gnome-options(7).

       -v, --version
	   Print gchem3d version information.

SEE ALSO

       gnome-options(7), gtk-options(7)

AUTHORS

       Jean Brefort <jean.brefort@normalesup.org>
	   Program author.

       Daniel Leidert <daniel.leidert@wgdd.de>
	   Manpage author.

COPYRIGHT

       Copyright (C) 2002-2007 Jean Brefort
       Copyright (C) 2004-2007 Daniel Leidert

       Permission is granted to copy, distribute and/or modify this document under the terms of the GNU General Public License, Version 2 or any
       later version published by the Free Software Foundation.

gcu 0.12				      $Date: 2009-03-19 10:53:47 +0100 (jeu. 19 mars 2009) $					GCHEM3D(1)
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