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Full Discussion: Replacing nth occurence
Top Forums Shell Programming and Scripting Replacing nth occurence Post 302366345 by radoulov on Thursday 29th of October 2009 09:45:52 AM
Old 10-29-2009
Given your sample data this should work:

Code:
  awk '{ for (i=1; i<=NF; i++)
           $i = i % 2 ? $i : "cba"
        }1'

Be aware that the above code will squeeze consecutive FS characters.

With Perl:

Code:
perl -pe's/(\w+)/$c++%2?cba:$1/ge'

Code:
% print abc abc abc abc abc abc |
  awk '{ for (i=1; i<=NF; i++)      
           $i = i % 2 ? $i : "cba"
        }1'
abc cba abc cba abc cba
% print abc abc abc abc abc abc |
  perl -pe's/(\w+)/$c++%2?cba:$1/ge'
abc cba abc cba abc cba



---------- Post updated at 02:45 PM ---------- Previous update was at 02:45 PM ----------

Quote:
Originally Posted by methyl
Code:
echo "abc abc abc abc abc abc"|sed -e "s/abc abc/abc cba/g"
abc cba abc cba abc cba

Nice Smilie
 

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GLGETMULTISAMPLEFV(3G)						    OpenGL 3.3						    GLGETMULTISAMPLEFV(3G)

NAME
glGetMultisamplefv - retrieve the location of a sample C SPECIFICATION
void glGetMultisamplefv(GLenum pname, GLuint index, GLfloat *val); PARAMETERS
pname Specifies the sample parameter name. pname must be GL_SAMPLE_POSITION. index Specifies the index of the sample whose position to query. val Specifies the address of an array to receive the position of the sample. DESCRIPTION
glGetMultisamplefv queries the location of a given sample. pname specifies the sample parameter to retrieve and must be GL_SAMPLE_POSITION. index corresponds to the sample for which the location should be returned. The sample location is returned as two floating-point values in val[0] and val[1], each between 0 and 1, corresponding to the x and y locations respectively in the GL pixel space of that sample. (0.5, 0.5) this corresponds to the pixel center. index must be between zero and the value of GL_SAMPLES - 1. If the multisample mode does not have fixed sample locations, the returned values may only reflect the locations of samples within some pixels. ERRORS
GL_INVALID_ENUM is generated if pname is not one GL_SAMPLE_POSITION. GL_INVALID_VALUE is generated if index is greater than or equal to the value of GL_SAMPLES. SEE ALSO
glGenFramebuffers(), glBindFramebuffer() COPYRIGHT
Copyright (C) 2010 Khronos Group. This material may be distributed subject to the terms and conditions set forth in the Open Publication License, v 1.0, 8 June 1999. http://opencontent.org/openpub/. OpenGL 3.3 03/08/2011 GLGETMULTISAMPLEFV(3G)
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