Login or Register to Ask a Question and Join Our Community

Sponsored Content
Full Discussion: Simple awk command to compare two files and print first difference
Top Forums Shell Programming and Scripting Simple awk command to compare two files and print first difference Post 302996501 by LMHmedchem on Wednesday 26th of April 2017 09:10:01 PM
Old 04-26-2017
In the end, I did this based on the code posted by Scrutinizer,

error_record=$(awk '{getline s<f} $0!=s{print; exit}' f=file2 file1)

It seems like it will work well enough and was the fastest of the methods that worked.

This suggestion of RudiC also worked but was marginally slower.

error_record=$(diff -y -b --suppress-common-lines file1 file2 | cut -f1 | head -1)

By slower I mean 0m0.391s as opposed to 0m0.156s with the first method. Not enough difference to bother with but I guess you need some reason to pick a method.

The method suggested by rdrtx1 also worked but again was a bit slower,

error_record=$(paste -d" " file1 file2 | awk '$1 != $2 {print $1; exit;}')

My guess is that the two slower methods both made calls to more than one program and this is the origin of the difference.

I was not able to get any output from this, even though it looks correct,

awk ' NR==FNR { a[NR]=$0; next } $0 != a[FNR] { print a[FNR]; exit }' file1 file2

Don't know what the issue is there.

LMHmedchem
Last edited by LMHmedchem; 04-26-2017 at 10:15 PM..
This User Gave Thanks to LMHmedchem For This Post:
Scrutinizer
 

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

to compare two files and to print the difference

suppose one file P1168S P2150L P85L Q597R R1097C Another file P2150L P85L Q597R R1097C R1379C R1587K Then output shud be R1379C R1587K thanks (5 Replies)
Discussion started by: cdfd123
5 Replies

2. Shell Programming and Scripting

awk to compare lines of two files and print output on screen

hey guys, I have two files both with two columns, I have already created an awk code to ignore certain lines (e.g lines that start with 963) as they wou ld begin with a certain string, however, the rest I have added together and calculated the average. At the moment the code also displays... (3 Replies)
Discussion started by: chlfc
3 Replies

3. Shell Programming and Scripting

Compare two files and print the two lines with difference

I have two files like this: #FILE 1 ABCD 4322 26485 JMTJ 5311 97248 XMPJ 4321 58978 #FILE 2 ABCD 4321 26485 JMTJ 5311 97248 XMPJ 4321 68978 What to do: Compare the two files and find those lines that doesn't match. And have a new file like this: #FILE 3 "from file 1" ABCD 4322 26485... (11 Replies)
Discussion started by: kingpeejay
11 Replies

4. Shell Programming and Scripting

awk to compare flat files and print output to another file

Hello, I am strugling from quite a some time to compare flat files with over 1 million records could anyone please help me. I want to compare two pipe delimited flat files, file1 with file2 and output the unmatched rows from file2 in file3 Sample File1: ... (9 Replies)
Discussion started by: suhaeb
9 Replies

5. Shell Programming and Scripting

Compare two columns in two files and print the difference

one file . . importing table employee 119 . . importing table jobs 1 2nd file . . importing table employee 120 . . importing table jobs 1 and would like... (2 Replies)
Discussion started by: jhonnyrip
2 Replies

6. Shell Programming and Scripting

Compare two files and output difference, by first field using awk.

It seems like a common task, but I haven't been able to find the solution. vitallog.txt 1310,John,Hancock 13211,Steven,Mills 122,Jane,Doe 138,Thoms,Doe 1500,Micheal,May vitalinfo.txt 12122,Jane,Thomas 122,Janes,Does 123,Paul,Kite **OUTPUT** vitalfiltered.txt 12122,Jane,Thomas... (2 Replies)
Discussion started by: charles33
2 Replies

7. Shell Programming and Scripting

awk compare specific columns from 2 files, print new file

Hello. I have two files. FILE1 was extracted from FILE2 and modified thanks to help from this post. Now I need to replace the extracted, modified lines into the original file (FILE2) to produce the FILE3. FILE1 1466 55.27433 14.72050 -2.52E+03 3.00E-01 1.05E+04 2.57E+04 1467 55.27433... (1 Reply)
Discussion started by: jm4smtddd
1 Replies

8. Shell Programming and Scripting

Compare two files and print using awk

I have 2 files: email_1.out 1 abc@yahoo.com 2 abc_1@yahoo.com 3 abc_2@yahoo.com data_1.out <tr> 1 MAIL # 1 TO src_1 </tr> <tr><td class="hcol">col_id</td> <td class="hcol">test_dt</td> <td class="hcol">user_type</td> <td class="hcol">ct</td></tr> <tr><td... (1 Reply)
Discussion started by: sol_nov
1 Replies

9. Shell Programming and Scripting

[Solved] awk compare two different columns of two files and print all from both file

Hi, I want to compare two columns from file1 with another two column of file2 and print matched and unmatched column like this File1 1 rs1 abc 3 rs4 xyz 1 rs3 stu File2 1 kkk rs1 AA 10 1 aaa rs2 DD 20 1 ccc ... (2 Replies)
Discussion started by: justinjj
2 Replies

10. Shell Programming and Scripting

Compare two variables and print the difference

Hi PRIM_SEQ=`some sql code` and output of PRIM_SEQ is like below 120 130 STB_SEQ=`some sql code` and output of STB_SEQ is like below 115 110 i need to compare this two variables output ( decimal numbers) 1) What I want to do is to compare every number in the PRIM_SEQ with... (8 Replies)
Discussion started by: amar1208
8 Replies

LEARN ABOUT DEBIAN

gchem3d

GCHEM3D(1)						       gnome-chemistry-utils							GCHEM3D(1)

NAME

       gchem3d - a small chemical viewer application

SYNOPSIS

       gchem3d [OPTION(S)...] [FILE...]

DESCRIPTION

       gchem3d is a small chemical viewer application, which can show several chemical file formats.

OPTIONS

       The following options are accepted:

       -b COLOR, --bgcolor=COLOR
	   Use the given color as background color.  COLOR can be one of "black" (default), "white", "#rrggbb" (don't forget to escape the "#"
	   character in the shell).

       -d MODEL, --display3d=MODEL
	   Choose how molecules are displayed.	MODEL can be one of "BallnStick" (default), "SpaceFill".

       -?, --help
	   Show application help options.

       --help-all, --help-*
	   Print all or just a group of help options. These options are not documented here. Instead see gtk-options(7) and gnome-options(7).

       -v, --version
	   Print gchem3d version information.

SEE ALSO

       gnome-options(7), gtk-options(7)

AUTHORS

       Jean Brefort <jean.brefort@normalesup.org>
	   Program author.

       Daniel Leidert <daniel.leidert@wgdd.de>
	   Manpage author.

COPYRIGHT

       Copyright (C) 2002-2007 Jean Brefort
       Copyright (C) 2004-2007 Daniel Leidert

       Permission is granted to copy, distribute and/or modify this document under the terms of the GNU General Public License, Version 2 or any
       later version published by the Free Software Foundation.

gcu 0.12				      $Date: 2009-03-19 10:53:47 +0100 (jeu. 19 mars 2009) $					GCHEM3D(1)
All times are GMT -4. The time now is 02:07 PM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy