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Top Forums Shell Programming and Scripting Find and replace a column that has '' to NULL in a comma delimited using awk or sed Post 302421187 by alister on Thursday 13th of May 2010 04:54:25 PM
Old 05-13-2010
Hello, gumal901, and welcome to the forums.

There is whitespace around the single quotes to be replaced, in the sample data. Since the problem statement does not specify that the whitespace should be removed, the following code matches a field that contains two consecutive single-quotes with optional leading and trailing whitespace. When the quotes are replaced with "NULL", the whitespace is left intact.

Code:
awk -F, '$59 ~ /^[[:blank:]]*'"''"'[[:blank:]]*$/ {sub(/'"''"'/,"NULL", $59)}; {print}' OFS=, file

Regards,
Alister

---------- Post updated at 04:54 PM ---------- Previous update was at 04:51 PM ----------

Quote:
Originally Posted by Tytalus
Code:
#  nawk -F, '{$59="\""?"NULL":$59;print}' OFS="," infile

That code will always replace the value of $59 with "NULL", which I doubt is what was intended.
 

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IGAWK(1)							 Utility Commands							  IGAWK(1)

NAME
igawk - gawk with include files SYNOPSIS
igawk [ all gawk options ] -f program-file [ -- ] file ... igawk [ all gawk options ] [ -- ] program-text file ... DESCRIPTION
Igawk is a simple shell script that adds the ability to have ``include files'' to gawk(1). AWK programs for igawk are the same as for gawk, except that, in addition, you may have lines like @include getopt.awk in your program to include the file getopt.awk from either the current directory or one of the other directories in the search path. OPTIONS
See gawk(1) for a full description of the AWK language and the options that gawk supports. EXAMPLES
cat << EOF > test.awk @include getopt.awk BEGIN { while (getopt(ARGC, ARGV, "am:q") != -1) ... } EOF igawk -f test.awk SEE ALSO
gawk(1) Effective AWK Programming, Edition 1.0, published by the Free Software Foundation, 1995. AUTHOR
Arnold Robbins (arnold@skeeve.com). ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +--------------------+-----------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +--------------------+-----------------+ |Availability | SUNWgawk | +--------------------+-----------------+ |Interface Stability | Volatile | +--------------------+-----------------+ NOTES
Source for gawk is available on http://opensolaris.org. Free Software Foundation Nov 3 1999 IGAWK(1)
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