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Full Discussion: substitute a string on a specific position for specific lines
Top Forums Shell Programming and Scripting substitute a string on a specific position for specific lines Post 302480599 by ctsgnb on Wednesday 15th of December 2010 10:22:45 AM
Old 12-15-2010
@anurag

Ooops, you are true, i totally forgot that position case ... here is an even better
- need caret ^ to be exact regarding the position otherwise the \(.....<n_times>\)TOCHANGE could also be match at a position greater than the expected one
- use the $! tip to avoid last line)
- therefore avoid the use of additionnal file opening & line counting of the wc -l
- no need of sed -e option

Code:
sed '3s/^\(...........\)TOCHANGE\(.*\)/\1ABCABCAB\2/;$!{4,$s/^\(........\)TOCHANGE\(.*\)/\1ABCABCAB\2/}' infile

Code:
# cat tst1
12345678901TOCHANGE12345
12345678901TOCHANGE12345
12345678901TOCHANGE12345
12345678901TOCHANGE12345
12345678901TOCHANGE12345
12345678901TOCHANGE12345
12345678901TOCHANGE12345
# cat tst2
12345678TOCHANGE12345
12345678TOCHANGE12345
12345678TOCHANGE12345
12345678TOCHANGE12345
12345678TOCHANGE12345
12345678TOCHANGE12345
12345678TOCHANGE12345
# sed '3s/^\(...........\)TOCHANGE\(.*\)/\1ABCABCAB\2/;$!{4,$s/^\(........\)TOCHANGE\(.*\)/\1ABCABCAB\2/}' tst1
12345678901TOCHANGE12345
12345678901TOCHANGE12345
12345678901ABCABCAB12345
12345678901TOCHANGE12345
12345678901TOCHANGE12345
12345678901TOCHANGE12345
12345678901TOCHANGE12345
# sed '3s/^\(...........\)TOCHANGE\(.*\)/\1ABCABCAB\2/;$!{4,$s/^\(........\)TOCHANGE\(.*\)/\1ABCABCAB\2/}' tst2
12345678TOCHANGE12345
12345678TOCHANGE12345
12345678TOCHANGE12345
12345678ABCABCAB12345
12345678ABCABCAB12345
12345678ABCABCAB12345
12345678TOCHANGE12345

Last edited by ctsgnb; 12-15-2010 at 11:52 AM.. Reason: forgot the caret ^
 

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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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