Confusing sed error message Post: 303027547

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Top Forums Shell Programming and Scripting Confusing sed error message Post 303027547 by Ralph on Tuesday 18th of December 2018 07:25:57 AM

12-18-2018

Registered User

Quote:

Originally Posted by Scrutinizer

Assuming the fields in your input file are whitespace separated, you could try this approach:

Code:

awk '!A[$2,$3]++ && !A[$3,$2]++' file

Quote:

Originally Posted by nezabudka

awk does not print a key equal to 1. It's print when the key is zero. Post increment ++
Value is first equal to 0 and then 1, 2, etc.
0 == fals == no print
1 == true == print
but the sign of inversion ! makes so
!0 == true == print
!1 == false == no print
!2 == false == no print

The keys are '$3,$2' and '$2,$3'. Right? The values after the entire file has been processed are either 2 or 1.

What I mean is when I leave out the END block nothing get's printed.

Code:

#!/usr/bin/awk -f
{
       !A[$2,$3]++ && !A[$3,$2]++
}

What awk program will deliver the same result as the one-liner awk !A[$2,$3]++ && !A[$3,$2]++ file ?

(I suspect I'm missing something obvious.)

Last edited by Ralph; 12-18-2018 at 08:31 AM..

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LEARN ABOUT DEBIAN

igawk

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)