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Top Forums Shell Programming and Scripting awk to identify empty fields in line Post 302980862 by cmccabe on Saturday 3rd of September 2016 07:16:00 PM
Old 09-03-2016
awk to identify empty fields in line

I am trying to use awk to identify and print out records in fields that are empty along with which line they are in. I hope the awk below is close, it runs but nothing results. Thank you Smilie.

awk

awk -F'\t' 'FNR==NR ~ /^[ ]*$/ { print "NR is empty" }' file


file
Code:
123    GOOD    ID    45

122    GOOD    TEST    55
123    GOOD    ID
145
145    GOOD    id    39

desired output
Code:
line2 $1 $2 $3 $4 are empty
line4 $4 is empty
line5 $2 $3 $4 are empty


Last edited by cmccabe; 09-03-2016 at 08:17 PM.. Reason: fixed format
 

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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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