Awk to print data from current and previous line Post: 302508700

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Top Forums UNIX for Dummies Questions & Answers Awk to print data from current and previous line Post 302508700 by awk_noob_456 on Monday 28th of March 2011 08:14:51 PM

03-28-2011

Registered User

Awk to print data from current and previous line

Hi guys,

I have found your forum super useful. However, right now I am stuck on a seemingly "simple" thing in AWK. I have two columns of data, the first column in Age (in million years) and the second column is Convergence Rate (in mm/yr).

I am trying to process my data so I can use it to create a step graph of the convergence rate of one continent to another. Here is a sample of my raw input.

105.0 125.2
100.0 128.5
95.0 114.8
90.0 128.1

I want to use awk to get my output to look like this:

105.0 125.2
100.0 125.2
100.0 128.5
95.0 128.5
95.0 114.8
90.0 114.8
90.0 128.1

So I print the first line as is. Then I print the first column from the next record, and the second column from the first line. Then I print both columns from the second line in the raw data, and I repeat that pattern.

I would really REALLY appreciate any help on this. It's really doing my head in - been looking online everywhere but haven't been able to figure it out... Thanks guys :-) If you guys need more info, let me know! Thanks again!

awk_noob_456

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LEARN ABOUT MOJAVE

colrm

COLRM(1)						    BSD General Commands Manual 						  COLRM(1)

NAME

     colrm -- remove columns from a file

SYNOPSIS

     colrm [start [stop]]

DESCRIPTION

     The colrm utility removes selected columns from the lines of a file.  A column is defined as a single character in a line.  Input is read
     from the standard input.  Output is written to the standard output.

     If only the start column is specified, columns numbered less than the start column will be written.  If both start and stop columns are spec-
     ified, columns numbered less than the start column or greater than the stop column will be written.  Column numbering starts with one, not
     zero.

     Tab characters increment the column count to the next multiple of eight.  Backspace characters decrement the column count by one.

ENVIRONMENT

     The LANG, LC_ALL and LC_CTYPE environment variables affect the execution of colrm as described in environ(7).

EXIT STATUS

     The colrm utility exits 0 on success, and >0 if an error occurs.

SEE ALSO

     awk(1), column(1), cut(1), paste(1)

HISTORY

     The colrm command appeared in 3.0BSD.

BSD
								  August 4, 2004							       BSD

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