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Full Discussion: Finding when a file switches direction using awk
Top Forums Shell Programming and Scripting Finding when a file switches direction using awk Post 302544052 by rdcwayx on Tuesday 2nd of August 2011 08:56:20 PM
Old 08-02-2011
In your request, you need three lines compare with, so need record the previous two lines each time.

NR==1{last=$2;last_row=$1;getline;cur=$2;cur_row=$1;next} will read the first two lines. getline will jump to next line easily within one line code.

If I write by this way, you will easily understand
Code:
NR==1{last=$2;last_row=$1} 
NR==2{cur=$2;cur_row=$1}

The rest code will start from line 3 which you already understood.

Test from your sample data, my code is fine. If there are any problems, you need paste some real data for test.
Last edited by rdcwayx; 08-02-2011 at 11:08 PM..
This User Gave Thanks to rdcwayx For This Post:
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LEARN ABOUT MINIX

paste

PASTE(1)						      General Commands Manual							  PASTE(1)

NAME

       paste - paste multiple files together

SYNOPSIS

       paste [-s] [-d list] file...

OPTIONS

       -d     Set delimiter used to separate columns to list.

       -s     Print files sequentially, file k on line k.

EXAMPLES

       paste file1 file2   # Print file1 in col 1, file2 in col 2

       paste -s f1 f2	   # Print f1 on line 1 and f2 on line 2

       paste -d : file1 file2
			   # Print the lines separated by a colon

DESCRIPTION

       Paste  concatenates  corresponding  lines of the given input files and writes them to standard output. The lines of the different files are
       separated by the delimiters given with the option -s. If no list is given, a tab is substituted for every linefeed, except  the	last  one.
       If  end-of-file	is hit on an input file, subsequent lines are empty.  Suppose a set of k files each has one word per line.  Then the paste
       output will have k columns, with the contents of file j in column j.  If the -s flag is given, then the first file is on line 1, the second
       file on line 2, etc.  In effect, -s turns the output sideways.

       If  a list of delimiters is given, they are used in turn.  The C escape sequences 
, 	, \, and  are used for linefeed, tab, backslash,
       and the null string, respectively.

																	  PASTE(1)
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