Sponsored Content
Top Forums Shell Programming and Scripting Compare lines in two files (Memory getting exhausted) Post 302337136 by sncoupons on Thursday 23rd of July 2009 12:52:24 PM
Old 07-23-2009
Compare lines in two files (Memory getting exhausted)

Hi,

Could someone please help me with the best approach to compare lines from one file to another? Here is how I have entries -

File 1
Code:
a1
a2
a3
a4
a9
a10
a15

File2
Code:
a5
a6
a15
a7
a9

Expected output is -
a15
a9
(order doesn't matter)


The file1 is a huge file. I am trying to execute following command -

Code:
grep -f File1 File2

When I do that, I get the error after a minute- grep: Memory exhausted.

Strangely, when I do grep -f File2 File1, then it doesn't give that error but output it generates is wrong as it prints some output that is not in File2!

Please help with what is the better way to compare and print output?
 

9 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Memory exhausted in awk

Dear All, I have executed a awk script in linux box which consists of 21 Million records.And i have two mapping files of 500 and 5200 records.To my surprise i found an error awk: cmd. line:19: (FILENAME=/home/FILE FNR=21031272) fatal: Memory exhausted. Is there any limitation for records... (3 Replies)
Discussion started by: cskumar
3 Replies

2. Shell Programming and Scripting

Trying to compare lines in 2 files

Hello, I am new to scripting and need some help. In looking at other posts on this forum, I came up with the following logic. I cannot figure out why I am getting names of files of the current directory in my echo output. Scenario: message file has a line containing the version. Version.txt... (2 Replies)
Discussion started by: brdholman
2 Replies

3. Shell Programming and Scripting

compare two files and to remove the matching lines on both the files

I have two files and need to compare the two files and to remove the matching lines from both the files (4 Replies)
Discussion started by: shellscripter
4 Replies

4. Shell Programming and Scripting

compare files and then remove some lines

Hi everyone I have a dilemma and I'm hoping someone has an answer for me. I have two files: # cat masterfile line3 line4 line5 line6 line7 # cat tempfile line1 line2 line3 line4 I want to compare tempfile with masterfile. (3 Replies)
Discussion started by: soliberus
3 Replies

5. Web Development

PHP Fatal error: Allowed memory size of 134217728 bytes exhausted

Any clues on how to get rid of this PHP error? PHP Fatal error: Allowed memory size of 134217728 bytes exhausted (tried to allocate 71 bytes) in /website/www/includes/functions_manpages.php on line 58 PHP Fatal error: Allowed memory size of 134217728 bytes exhausted (tried to allocate 71... (4 Replies)
Discussion started by: Neo
4 Replies

6. Shell Programming and Scripting

Error PHP Fatal error: Allowed memory size of 67108864 bytes exhausted(tried to allocate 401 bytes)

While running script I am getting an error like Few lines in data are not being processed. After googling it I came to know that adding such line would give some memory to it ini_set("memory_limit","64M"); my input file size is 1 GB. Is that memory limit is based on RAM we have on... (1 Reply)
Discussion started by: elamurugu
1 Replies

7. Shell Programming and Scripting

Compare files by lines and columns

Inspired by the extremely short awk code from Ygor on this post I wanted to compare two files on only one field. I can't get it to work. Can anybody help on explaining the code and fix the code? My code which does not work: awk 'BEGIN{a=1};a!=1' file1.txt file2.txt >outfile.txt file1.txt... (1 Reply)
Discussion started by: sdf
1 Replies

8. UNIX for Dummies Questions & Answers

Compare lines in 2 files

I have 2 files with exactly the same information (with header and separated by ";") and what I would like to do is print (for both files!) the columns that are different and also print the "key" column that is equal in the 2 files For example, if File1: key1;aaa;bbb;ccc key2;ddd;eee;fff... (4 Replies)
Discussion started by: mvalonso
4 Replies

9. Shell Programming and Scripting

Compare lines between two files

I have two files I need to compare these two files and take the lines that are common in both the files and consider the line present in second file for my further processing I have used "Awk" along with "FNR and NR" but that is not working gawk -F= ' > FNR==NR {a=$1; next}; > ... (2 Replies)
Discussion started by: Priya Amaresh
2 Replies
ZGREP(1)						      General Commands Manual							  ZGREP(1)

NAME
zgrep - search possibly compressed files for a regular expression SYNOPSIS
zgrep [ grep_options ] [ -e ] pattern filename... DESCRIPTION
Zgrep invokes grep on compressed or gzipped files. These grep options will cause zgrep to terminate with an error code: (-[drRzZ]|--di*|--exc*|--inc*|--rec*|--nu*). All other options specified are passed directly to grep. If no file is specified, then the standard input is decompressed if necessary and fed to grep. Otherwise the given files are uncompressed if necessary and fed to grep. If the GREP environment variable is set, zgrep uses it as the grep program to be invoked. EXIT CODE
2 - An option that is not supported was specified. AUTHOR
Charles Levert (charles@comm.polymtl.ca) SEE ALSO
grep(1), gzexe(1), gzip(1), zdiff(1), zforce(1), zmore(1), znew(1) ZGREP(1)
All times are GMT -4. The time now is 05:07 PM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy