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Top Forums Shell Programming and Scripting Deleting columns by list or file Post 302376354 by flxms on Tuesday 1st of December 2009 08:49:05 AM
Old 12-01-2009
Deleting columns by list or file

Dear specialists out there, please help a poor awk newbie:

I have a very huge file to process consisting of 300000 columns and 1500 rows. About 20000 columns shall be deleted from that file. So it is clear, that I can't do this by writing down all the columns in an awk command like $1, $x etc.

I have a text-file containing one column with the identifiers for these 20000 columns, that shall be removed (corresponding to the identifiers in the header/first line in file to process).

Can anyone give me a hint ho to do this with awk or a shell script?
I'd appreciate any kind of help very much!

Best regards, Felix
 

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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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