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Top Forums Shell Programming and Scripting Delete line by pattern match in column Post 302948545 by RudiC on Tuesday 30th of June 2015 10:16:41 AM
Old 06-30-2015
On top of single quotes preventing the shell's expansion of variables, that's not the right way to supply parameters to awk. And, the above use of backticks is not clear to me. Try
Code:
awk -F"\|" -vNM=$NUM "\$2 !~ NM" file

But, wouldn't it be much better NOT to run awk n times, and NOT to read file n times?
Look at this if it does what you need:
Code:
awk -F"\|"  'NR==FNR {T[$1]; next} $2 in T {next} 1' deletelines  file
5|23422|pow|
3|34324|how|

 

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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). Free Software Foundation Nov 3 1999 IGAWK(1)
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