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Full Discussion: position specific replace in file
Top Forums Shell Programming and Scripting position specific replace in file Post 302600733 by balajesuri on Wednesday 22nd of February 2012 02:03:02 AM
Old 02-22-2012
Code:
1s/\(^.\{17\}\).\{8\}\(.*\)/\1some123text\2/

--> '1s' refers to substitution only in the first line. First 17 characters (matched by pattern in green) are stored in buffer, referenced by \1. The next 8 characters (i.e. from char 18 through to 25, pattern in blue) are matched. Rest of the line (pattern in red) is stored in buffer, reference by \2. This whole thing is substituted by "\1some123text\2".


Code:
 /^5900/s/\(^.\{4\}\).\{13\}\(.*\)/\1some123text\2/

--> Pattern in green matches line starting with 5900. In such lines, first 4 characters (pattern in blue) are stored in buffer, referenced by \1. The next 13 characters (i.e. from char 5 through to 17, pattern in red) are matched. Rest of the line (pattern in pink) is stored in buffer, referenced by \2. This whole thing is substituted by "\1some123text\2".
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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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