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Top Forums Shell Programming and Scripting How to remove mth and nth column from a file? Post 302841171 by konsolebox on Wednesday 7th of August 2013 05:09:03 AM
Old 08-07-2013
Considering the use of FS and OFS I now have this version:
Code:
awk -v m=3 -v n=9 -v FS=, -v OFS=, -- '{
    j = 0
    for (i = 1; i <= NF; ++i) {
        if (i == m || i == n) {
            ++j
            continue
        }
        $(i - j) = $i
    }
    NF -= j
    print
}'

And adding Alister's suggestion this is the best change I could have for my original code:
Code:
awk -v m=3 -v n=9 FS=, OFS=, -- '{
    append = 0
    for (i = 1; i <= NF; ++i) {
        if (i != m && i != n) {
            if (append) {
                s = s OFS $i
            } else {
                s = $i
                append = 1
            }
        }
    }
    print s
    s = ""
}' file


Last edited by konsolebox; 08-07-2013 at 06:29 AM..
 

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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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