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Top Forums Shell Programming and Scripting Joining files using awk not extracting all columns from File 2 Post 302970537 by venkat_reddy on Thursday 7th of April 2016 05:04:02 PM
Old 04-07-2016
Joining files using awk not extracting all columns from File 2

Hello All

I'm joining two files using Awk by Left outer join on the file 1

File 1

Code:
1 AA
2 BB
3 CC
4 DD

File 2

Code:
1 IND 100 200 300
2 AUS 400 500 600
5 USA 700 800 900

Below is the command used to do the left outer join:

Code:
awk 'NR==FNR{A[$1]=$2;next}{print$0 FS (A[$1]?A[$1]:"missing")}' file2 file1

Below is the output:
Code:
1 AA  IND
2 BB AUS
3 CC missing
4 DD missing

If you see, only first column from File 2 is being extracted and other columns are being ignored.

Any thoughts?

Thanks in advance.

Last edited by Scrutinizer; 04-08-2016 at 03:01 AM.. Reason: quote tags of input file -> code tags
 

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machid(1)						      General Commands Manual							 machid(1)

NAME
machid: hp9000s200, hp9000s300, hp9000s400, hp9000s500, hp9000s700, hp9000s800, hp-mc680x0, hp-pa, pdp11, u370, u3b, u3b10, u3b2, u3b5, vax - provide truth value about processor type SYNOPSIS
DESCRIPTION
The following commands return a true value (exit code 0) if the a processor type matches the command name. Otherwise a false value (exit code nonzero) is returned. These commands are commonly used within makefiles and shell procedures to improve portability of applications (see make(1)). +-----------+-------------------------++--------+--------------------------+ |Command | True for ||Command | True for | +-----------+-------------------------++--------+--------------------------+ |hp9000s200 | Series 200 ||pdp11 | PDP-11/45 or PDP-11/70 | |hp9000s300 | Series 300 ||u3b | 3B20 computer | |hp9000s400 | Series 400 ||u3b2 | 3B2 computer | |hp9000s500 | Series 500 ||u3b5 | 3B5 computer | |hp9000s700 | Series 700 ||u3b10 | 3B10 computer | |hp9000s800 | Series 800 or 700 ||u370 | IBM System/370 computer | |hp-mc680x0 | Series 200, 300, or 400 ||vax | VAX-11/750 or VAX-11/780 | |hp-pa | Series 700 or 800 || | | +-----------+-------------------------++--------+--------------------------+ EXAMPLES
Given a shell script that must behave differently when run on an HP 9000 Series 700 or 800 system, select the correct code segment to be executed: WARNINGS
always returns true on both Series 800 and Series 700 systems. Therefore, when using this command in scripts to determine hardware type, always use both and in the appropriate sequence to ensure correct results (see machid(1) will no longer provide support for future machines beyond the Series 800 and Series 700 systems. Decisions should be based on the hardware and software configuration information returned by getconf(1). SEE ALSO
getconf(1), make(1), sh(1), test(1), true(1). machid(1)
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