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Full Discussion: Complex find and replace only 1st instance string with dynamic combination
Top Forums Shell Programming and Scripting Complex find and replace only 1st instance string with dynamic combination Post 302560686 by SilvesterJ on Friday 30th of September 2011 02:05:50 PM
Old 09-30-2011
Complex find and replace only 1st instance string with dynamic combination
test.txt is the dynamic file but some of combination are fix

like below are the lines
Code:
;wonder_off =
;wonder_off = disabled
wonder_off =
wonder_off = disabled

the test.txt can content them in any order

Code:
#cat test.xt 
;wonder_off =
;wonder_off = disabled
wonder_off =
wonder_off = disabled

OR

Code:
#cat test.xt 
wonder_off =
wonder_off = disabled
;wonder_off =
;wonder_off = disabled

I need to find and replace only 1st instatnce of the test.xt

example if:

Code:
#cat test.xt 
;wonder_off =
;wonder_off = disabled
wonder_off =
wonder_off = disabled

find ";wonder_off =" and replace it with "wonder_off = "Enabled,working_bar,extra_deft""


Result should be :
Code:
cat test.xt 
wonder_off = "Enabled,working_bar,extra_deft"
;wonder_off = disabled
wonder_off =
wonder_off = disabled


I can managed to get only 1st line which can be any combination i mention above
Code:
#VAR=`cat test.xt | head -1`


#echo $VAR
;wonder_off =

How can I Find only 1st instance with matching string and replace it with "wonder_off = "Enabled,working_bar,extra_deft""
Last edited by Scott; 09-30-2011 at 03:30 PM.. Reason: CODE TAGS...
 

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LEARN ABOUT CENTOS

gldepthmask

GLDEPTHMASK(3G) 						   OpenGL Manual						   GLDEPTHMASK(3G)

NAME

       glDepthMask - enable or disable writing into the depth buffer

C SPECIFICATION

       void glDepthMask(GLboolean flag);

PARAMETERS

       flag
	   Specifies whether the depth buffer is enabled for writing. If flag is GL_FALSE, depth buffer writing is disabled. Otherwise, it is
	   enabled. Initially, depth buffer writing is enabled.

DESCRIPTION

       glDepthMask specifies whether the depth buffer is enabled for writing. If flag is GL_FALSE, depth buffer writing is disabled. Otherwise, it
       is enabled. Initially, depth buffer writing is enabled.

ASSOCIATED GETS

       glGet() with argument GL_DEPTH_WRITEMASK

NOTES

       Even if the depth buffer exists and the depth mask is non-zero, the depth buffer is not updated if the depth test is disabled. In order to
       unconditionally write to the depth buffer, the depth test should be enabled and set to GL_ALWAYS (see glDepthFunc()).

SEE ALSO

       glColorMask(), glDepthFunc(), glDepthRange(), glStencilMask()

COPYRIGHT

       Copyright (C) 1991-2006 Silicon Graphics, Inc. Copyright (C) 2012 Khronos Group. This document is licensed under the SGI Free Software B
       License. For details, see http://oss.sgi.com/projects/FreeB/.

AUTHORS

       opengl.org

opengl.org							    06/10/2014							   GLDEPTHMASK(3G)
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