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Full Discussion: awk if statement / equals operator
Top Forums UNIX for Dummies Questions & Answers awk if statement / equals operator Post 302745465 by hergp on Monday 17th of December 2012 10:05:27 AM
Old 12-17-2012
One way would be to avoid decimal numbers. For me, this works

Code:
awk '{ if( 10*0.3 == 10*0.1*3) print $1}' file.dat
awk '{ if( 10*0.7 == 10*0.1*7) print $1}' file.dat

A different approach would be to avoid equal compares with decimal numbers. Instead you could write
Code:
awk '{ if( abs(0.3 - 0.1*3) < 0.00001) print $1}' file.dat

But since awk does not have a builtin abs function, you would have to provide one in your awk-script:
Code:
function abs(x) {
    return ((x < 0.0) ? -x : x)
}

 

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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)
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