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Full Discussion: Help with the awk syntax
Top Forums Shell Programming and Scripting Help with the awk syntax Post 302817813 by juzz4fun on Thursday 6th of June 2013 01:31:16 PM
Old 06-06-2013
Help with the awk syntax

Hello Experts:

While writing a script to help one of the posts on here, I end up writing a wrong one. I am very much eager to know how this can be corrected.
Aim was to not print specified columns - lets say out of 100 fields, need to print all but 5th, 10th, 15th columns.
Someone already answered it - $5=$10=$15="". This also should work.
I was thinking in another way to do it: Store the fields that needs to be excluded, in a separate file - nofields

Below is the script that I wrote:

awk 'NR==FNR{a[$1];next}{for (i = 1; i <= NF; i++)if(i not in a)print $i}' nofields input

I am sure there is mistakes in it, but interested in knowing what it is.

Last edited by juzz4fun; 06-06-2013 at 02:47 PM..
 

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CUT(1)							      General Commands Manual							    CUT(1)

NAME
cut - select out columns of a file SYNOPSIS
cut [ -b | -c] list [file...] cut -f list [-d delim] [ -s] OPTIONS
-b Cut specified bytes -c Select out specific characters -d Change the column delimiter to delim -f Select out specific fields that are separated by the -i Runs of delimiters count as one -s Suppres lines with no delimiter characters, when used EXAMPLES
cut -f 2 file # Extract field 2 cut -c 1-2,5 file # Extract character columns 1, 2, and 5 cut -c 1-5,7- file # Extract all columns except 6 DESCRIPTION
[file...]" delimiter character ( see delim)" with the -f option. Lines with no delimiters are passwd through untouched" Cut extracts one or more fields or columns from a file and writes them on standard output. If the -f flag is used, the fields are sepa- rated by a delimiter character, normally a tab, but can be changed using the -d flag. If the -c flag is used, specific columns can be specified. The list can be comma or BLANK separated. The -f and -c flags are mutually exclusive. Note: The POSIX1003.2 standard requires the option -b to cut out specific bytes in a file. It is intended for systems with multi byte characters (e.g. kanji), since MINIX uses only one byte characters, this option is equivalent to -c. For the same reason, the option -n has no effect and is not listed in this man- ual page. SEE ALSO
sed(1), awk(9). CUT(1)
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