For your questions, why a[$1] didn't throw errors because if any variable is NOT initialized in awk and we are using it in any condition or etc then its value will be considered as NULL, hence NO ERRORS in it.
I am adding a detailed level of explanation here for my solution above:
Code:
awk ' ##Starting awk program from here.
BEGIN{ ##Starting BEGIN section of this awk code here.
FS=OFS="|" ##Setting FS and OFS as pipe here.
}
FNR==NR{ ##Checking condition if FNR==NR which will be TRUE when first time Input_file is being read.
b[$1]=length($3)>a[$1]?$3:b[$1] ##Creating array b with index $1 and checking if value of length of $3 is grater than value of a[$3] then keep value of length of $3 else keep OLD Value in it.
a[$1]=length($3)>a[$1]?length($3):a[$1] ##Creating array a with index $1 and checking condition if length of $3 is grater than a[$1] then save value as length($3) or keep the OLD value to it. This array a is basically has length in integer form value with index $1 to be used later in condition.
next ##next will skip all further statements from here,
}
length($3)<a[$1]{ ##Checking condition if length of 3rd field is lesser than value of array a with index $1 then
$3=b[$1] ##Setting current $3 to value of array b with index of $1 here.
}
1 ##1 will print edited/non-edited values of current line.
' Input_file Input_file ##Mentioning Input_file 2 times here.
These 2 Users Gave Thanks to RavinderSingh13 For This Post:
I will be performing a task on several directories, each containing a large number of files (2500+) that follow a regular naming convention:
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Hi!
I have a difficult problem, to step up a unknown version number in a text file, and save the file. It would be great to run script.sh and the version gets increased.
Example the content of the textfile.txt
hello
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Hello, I am using awk to match text in a tab separated field and am able to do so when matching the exact word. My problem is that I would like to match any sequence of text in the tab-separated field without having to match it all. Any help will be appreciated. Please see the code below.
awk... (3 Replies)
here is what i want to achieve... consider a file contains below contents. the file size is large about 60mb
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Hi all !
I almost did it but got a small problem.
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cars red
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Wanted:
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Hi,
Wish to remove "DR-" from the string variable (var).
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Expected Output:
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Discussion started by: mohtashims
4 Replies
LEARN ABOUT OSX
glgetactiveuniformname
GLGETACTIVEUNIFORMNA(3G) OpenGL 3.3 GLGETACTIVEUNIFORMNA(3G)NAME
glGetActiveUniformName - query the name of an active uniform
C SPECIFICATION
void glGetActiveUniformName(GLuint program, GLuint uniformIndex, GLsizei bufSize, GLsizei *length, GLchar *uniformName);
PARAMETERS
program
Specifies the program containing the active uniform index uniformIndex.
uniformIndex
Specifies the index of the active uniform whose name to query.
bufSize
Specifies the size of the buffer, in units of GLchar, of the buffer whose address is specified in uniformName.
length
Specifies the address of a variable that will receive the number of characters that were or would have been written to the buffer
addressed by uniformName.
uniformName
Specifies the address of a buffer into which the GL will place the name of the active uniform at uniformIndex within program.
DESCRIPTION
glGetActiveUniformName returns the name of the active uniform at uniformIndex within program. If uniformName is not NULL, up to bufSize
characters (including a nul-terminator) will be written into the array whose address is specified by uniformName. If length is not NULL,
the number of characters that were (or would have been) written into uniformName (not including the nul-terminator) will be placed in the
variable whose address is specified in length. If length is NULL, no length is returned. The length of the longest uniform name in program
is given by the value of GL_ACTIVE_UNIFORM_MAX_LENGTH, which can be queried with glGetProgram().
If glGetActiveUniformName is not successful, nothing is written to length or uniformName.
program must be the name of a program for which the command glLinkProgram() has been issued in the past. It is not necessary for program to
have been linked successfully. The link could have failed because the number of active uniforms exceeded the limit.
uniformIndex must be an active uniform index of the program program, in the range zero to GL_ACTIVE_UNIFORMS - 1. The value of
GL_ACTIVE_UNIFORMS can be queried with glGetProgram().
ERRORS
GL_INVALID_VALUE is generated if uniformIndex is greater than or equal to the value of GL_ACTIVE_UNIFORMS.
GL_INVALID_VALUE is generated if bufSize is negative.
GL_INVALID_VALUE is generated if program is not the name of a program object for which glLinkProgram() has been issued.
SEE ALSO
glGetActiveUniform(), glGetUniformIndices(), glGetProgram(), glLinkProgram()
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 GLGETACTIVEUNIFORMNA(3G)
01-14-2020
