Sponsored Content
Top Forums UNIX for Advanced & Expert Users Performance problem with removing duplicates in a huge file (50+ GB) Post 302752727 by Corona688 on Monday 7th of January 2013 12:31:39 PM
Old 01-07-2013
I don't think there is a super-fast way to handle 50G of data.

Taking advantage of a database index sounds as good a way as any, a proper DB is designed to duplicate-check data larger than memory.
 

10 More Discussions You Might Find Interesting

1. UNIX for Dummies Questions & Answers

removing duplicates from a file

i have a file with some 1000 entries it will contain entries like 1000,ram 2000,pankaj 1001,rahim 1000,ram 2532,govind 2000,pankaj 3000,venkat 2532,govind what i want is i want to extract only the distinct rows from this file so my output should contain only 1000,ram... (2 Replies)
Discussion started by: trichyselva
2 Replies

2. UNIX for Dummies Questions & Answers

removing duplicates of a pattern from a file

hey all, I need some help. I have a text file with names in it. My target is that if a particular pattern exists in that file more than once..then i want to rename all the occurences of that pattern by alternate patterns.. for e.g if i have PATTERN occuring 5 times then i want to... (3 Replies)
Discussion started by: ashisharora
3 Replies

3. Shell Programming and Scripting

Removing duplicates from log file?

I have a log file with posts looking like this: -- Messages can be delivered by different systems at different times. The id number is used to sort out duplicate messages. What I need is to strip the arrival time from each post, sort posts by id number, and reattach arrival time to respective... (2 Replies)
Discussion started by: Ilja
2 Replies

4. Shell Programming and Scripting

Removing Duplicates from file

Hi Experts, Please check the following new requirement. I got data like the following in a file. FILE_HEADER 01cbbfde7898410| 3477945| home| 1 01cbc275d2c122| 3478234| WORK| 1 01cbbe4362743da| 3496386| Rich Spare| 1 01cbc275d2c122| 3478234| WORK| 1 This is pipe separated file with... (3 Replies)
Discussion started by: tinufarid
3 Replies

5. Shell Programming and Scripting

formatting a file and removing duplicates

Hi, I have a file that I want to change the format of. It is a large file in rows but I want it to be comma separated (comma then a space). The current file looks like this: HI, Joe, Bob, Jack, Jack After I would want to remove any duplicates so it would look like this: HI, Joe,... (2 Replies)
Discussion started by: kylle345
2 Replies

6. HP-UX

Performance issue with 'grep' command for huge file size

I have 2 files; one file (say, details.txt) contains the details of employees and another file (say, emp.txt) has some selected employee names. I am extracting employee details from details.txt by using emp.txt and the corresponding code is: while read line do emp_name=`echo $line` grep -e... (7 Replies)
Discussion started by: arb_1984
7 Replies

7. UNIX for Dummies Questions & Answers

Removing duplicates from a file

Hi All, I am merging files coming from 2 different systems ,while doing that I am getting duplicates entries in the merged file I,01,000131,764,2,4.00 I,01,000131,765,2,4.00 I,01,000131,772,2,4.00 I,01,000131,773,2,4.00 I,01,000168,762,2,2.00 I,01,000168,763,2,2.00... (5 Replies)
Discussion started by: Sri3001
5 Replies

8. Shell Programming and Scripting

Removing duplicates from new file

i hav two files like i want to remove/delete all the duplicate lines in file2 which are viz unix,unix2,unix3 (2 Replies)
Discussion started by: sagar_1986
2 Replies

9. Shell Programming and Scripting

Removing duplicates from new file

i hav two files like i want to remove/delete all the duplicate lines in file2 which are viz unix,unix2,unix3.I have tried previous post also,but in that complete line must be similar.In this case i have to verify first column only regardless what is the content in succeeding columns. (3 Replies)
Discussion started by: sagar_1986
3 Replies

10. Shell Programming and Scripting

Removing White spaces from a huge file

I am trying to remove whitespaces from a file containing sample data as: 457 <EOFD> Mar 1 2007 12:00:00:000AM <EOFD> Mar 31 2007 12:00:00:000AM <EOFD> system <EORD> 458 <EOFD> Mar 1 2007 12:00:00:000AM<EOFD>agf <EOFD> Apr 20 2007 9:10:56:036PM <EOFD> prodiws<EORD> . Basically these... (11 Replies)
Discussion started by: amvip
11 Replies
CDBW(3) 						   BSD Library Functions Manual 						   CDBW(3)

NAME
cdbw_open, cdbw_put, cdbw_put_data, cdbw_put_key, cdbw_stable_seeder, cdbw_output, cdbw_close -- create constant databases SYNOPSIS
#include <archive_entry.h> struct cdbw * cdbw_open(void); int cdbw_put(struct cdbw *cdbw, const void *key, size_t keylen, const void *data, size_t datalen); int cdbw_put_data(struct cdbw *cdbw, const void *data, size_t datalen, uint32_t *index); int cdbw_put_key(struct cdbw *cdbw, const void *key, size_t keylen, uint32_t index); uint32_t cdbw_stable_seeder(void); int cdbw_output(struct cdbw *cdbw, int output, const char descr[16], uint32_t (*seedgen)(void)); void cdbw_close(struct cdbw *cdbw); DESCRIPTION
The cdbw functions are used to create a constant databases for use with cdbr(3). Details about the file format, including overhead and limi- tations, can be found in cdb(5). cdbw_open() prepares a new cdb writer. The function returns a handle to pass to the other functions. cdbw_close() frees all resources associated with the handle. cdbw_put() adds the given (key,value) pair after checking for a duplicate key. cdbw_put_data() adds the given value to the writer without adding a key reference. The returned index can be used in subsequent calls to cdbw_put_key() to add one or more keys pointing to this value. cdbw_put_key() checks for duplicate keys and valid index arguments. On success it adds the given key. cdbw_output() computes the database file and writes it to the given descriptor. The function returns an error if the file cannot be written correctly. The descr() parameter provides a human readable description of the database content. The seedgen() parameter can be used to override the default PRNG. The bitwise layout of the output depends on the chosen seed. The function should return a different value for each invocation. The cdbw_stable_seeder() can be used to create reproducible output. It may be slower than the default. SEE ALSO
cdbr(3), cdb(5) HISTORY
Support for the cdb format first appeared in NetBSD 6.0. AUTHORS
The cdbr and cdbw functions have been written by Joerg Sonnenberger <joerg@NetBSD.org>. BSD
June 3, 2012 BSD
All times are GMT -4. The time now is 08:00 AM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy