Shell Programming and Scripting

Hello!

I'm new to linux programming. It would be great if you could help me out.

I have a matrix of kind:

10 30.0
20 190.5
40 180.
50 320.5

I would like
to substract 180 from column 2 If the value is >180
to add 180 for column 2 If the value is <180
nothing if it is equal to 180.

The output should look like

10 210.0
20 10.5
40 180.
50 140.5

Thank indeed for the help.

Code:

awk '{t=$2}$2>180{t-=180}$2<180{t+=180}{$2=t}1' file

Thanks for the prompt helpful reply.

I have saved my matrix in a file a.dat and the script file as pm180

#!/bin/bash

cat $1 | awk '{t=$2}$2>180{t-=180}$2<180{t+=180}{$2=t}1' >file

and excuted the script as follows:

pm180 a.dat

Sucessfuly excuted!

Try this:

Code:

awk '{$2=(($2==180?0:$2)+180)%360; print}' file