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Full Discussion: using awk to print absolute value
Top Forums Shell Programming and Scripting using awk to print absolute value Post 302451580 by dealerso on Tuesday 7th of September 2010 09:28:36 AM
Old 09-07-2010
using awk to print absolute value
Hi,
I have a file contaning some variables with negative values, but i just want to print the positive value
Code:
awk -F"|" '$2<0 { print $1,$2 }' tom.unl > tee.unl

i want the $2 = absolute value eg

-200 should print 200

How can i do this.
Last edited by Franklin52; 09-08-2010 at 04:38 AM.. Reason: Please use code tags!
 

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LEARN ABOUT CENTOS

atan2f

ATAN2(3)						     Linux Programmer's Manual							  ATAN2(3)

NAME

       atan2, atan2f, atan2l - arc tangent function of two variables

SYNOPSIS

       #include <math.h>

       double atan2(double y, double x);
       float atan2f(float y, float x);
       long double atan2l(long double y, long double x);

       Link with -lm.

   Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

       atan2f(), atan2l():
	      _BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 600 || _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L;
	      or cc -std=c99

DESCRIPTION

       The  atan2() function calculates the principal value of the arc tangent of y/x, using the signs of the two arguments to determine the quad-
       rant of the result.

RETURN VALUE

       On success, these functions return the principal value of the arc tangent of y/x in radians; the return value is in the range [-pi, pi].

       If y is +0 (-0) and x is less than 0, +pi (-pi) is returned.

       If y is +0 (-0) and x is greater than 0, +0 (-0) is returned.

       If y is less than 0 and x is +0 or -0, -pi/2 is returned.

       If y is greater than 0 and x is +0 or -0, pi/2 is returned.

       If either x or y is NaN, a NaN is returned.

       If y is +0 (-0) and x is -0, +pi (-pi) is returned.

       If y is +0 (-0) and x is +0, +0 (-0) is returned.

       If y is a finite value greater (less) than 0, and x is negative infinity, +pi (-pi) is returned.

       If y is a finite value greater (less) than 0, and x is positive infinity, +0 (-0) is returned.

       If y is positive infinity (negative infinity), and x is finite, pi/2 (-pi/2) is returned.

       If y is positive infinity (negative infinity) and x is negative infinity, +3*pi/4 (-3*pi/4) is returned.

       If y is positive infinity (negative infinity) and x is positive infinity, +pi/4 (-pi/4) is returned.

ERRORS

       No errors occur.

CONFORMING TO

       C99, POSIX.1-2001.  The variant returning double also conforms to SVr4, 4.3BSD, C89.

SEE ALSO

       acos(3), asin(3), atan(3), carg(3), cos(3), sin(3), tan(3)

COLOPHON

       This page is part of release 3.53 of the Linux man-pages project.  A description of the project, and information about reporting bugs,  can
       be found at http://www.kernel.org/doc/man-pages/.

								    2010-09-20								  ATAN2(3)
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