Login or Register to Ask a Question and Join Our Community


Shell Programming and Scripting

Honey, I broke awk! (duplicate line removal in 30M line 3.7GB csv file)

Login to Discuss or Reply to this Discussion in Our Community

 
Thread Tools Search this Thread
Top Forums Shell Programming and Scripting Honey, I broke awk! (duplicate line removal in 30M line 3.7GB csv file)
# 15  
Old 03-27-2014
Quote:
Originally Posted by Chubler_XL
Did you try my perl code? I have fairly high hopes it could do the job.
I'd love to but I don't know any perl. How do I handle the file I/O in perl?

Mike
# 16  
Old 03-27-2014
Save this as uniq.pl:
Code:
#!/usr/bin/perl -w
use Digest::MD5 qw(md5);
my %seen;
while (<>) {
  print $_ unless ($seen{md5($_)}++);
}

Then run is like this:

Code:
$ ./uniq.pl < big_ass_file_with_dups.csv > slightly_smaller_no_dups.csv

These 3 Users Gave Thanks to Chubler_XL For This Post:
Kibou Michael Stora Yoda
# 17  
Old 03-27-2014
Goodness! I need to learn some perl!

Executed in 92 seconds! Output looks correct.

Mike

Edit: Under 64-bit Cygwin is took about 74 seconds.
Last edited by Michael Stora; 03-27-2014 at 08:09 PM..
# 18  
Old 03-27-2014
Should an md5 collision occur, it will suppress a record which should be printed. Be aware that it's possible (if not probable) that your results may incorrectly omit data.

Regards,
Alister
This User Gave Thanks to alister For This Post:
Chubler_XL
# 19  
Old 03-27-2014
1 in 3x10³⁸ I like those odds!
# 20  
Old 03-27-2014
Quote:
Originally Posted by Chubler_XL
1 in 3x10³⁸ I like those odds!
However remote the possibility, it merits mentioning in case it's a critical task.

Regards,
Alister
# 21  
Old 03-28-2014
What about this ?
Code:
sort -S 1500M -T $HOME/path -u input.txt > sortedUniq.txt

Code:
-T, --temporary-directory=DIR
              use DIR for temporaries, not $TMPDIR or /tmp; multiple options specify multiple directories
S, --buffer-size=SIZE
              use SIZE for main memory buffer
Login or Register to Ask a Question

Previous Thread | Next Thread

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Printing string from last field of the nth line of file to start (or end) of each line (awk I think)

My file (the output of an experiment) starts off looking like this, _____________________________________________________________ Subjects incorporated to date: 001 Data file started on machine PKSHS260-05CP ********************************************************************** Subject 1,... (9 Replies)
Discussion started by: samonl
9 Replies

2. UNIX for Dummies Questions & Answers

Using awk to remove duplicate line if field is empty

Hi all, I've got a file that has 12 fields. I've merged 2 files and there will be some duplicates in the following: FILE: 1. ABC, 12345, TEST1, BILLING, GV, 20/10/2012, C, 8, 100, AA, TT, 100 2. ABC, 12345, TEST1, BILLING, GV, 20/10/2012, C, 8, 100, AA, TT, (EMPTY) 3. CDC, 54321, TEST3,... (4 Replies)
Discussion started by: tugar
4 Replies

3. Shell Programming and Scripting

Duplicate line removal matching some columns only

I'm looking to remove duplicate rows from a CSV file with a twist. The first row is a header. There are 31 columns. I want to remove duplicates when the first 29 rows are identical ignoring row 30 and 31 BUT the duplicate that is kept should have the shortest total character length in rows 30... (6 Replies)
Discussion started by: Michael Stora
6 Replies

4. Shell Programming and Scripting

awk concatenate every line of a file in a single line

I have several hundreds of tiny files which need to be concatenated into one single line and all those in a single file. Some files have several blank lines. Tried to use this script but failed on it. awk 'END { print r } r && !/^/ { print FILENAME, r; r = "" }{ r = r ? r $0 : $0 }' *.txt... (8 Replies)
Discussion started by: sdf
8 Replies

5. Shell Programming and Scripting

Read csv file line by line

Folks , i want to read a csv file line by line till the end of file and filter the text in the line and append everything into a variable. csv file format is :- trousers:shirts,price,50 jeans:tshirts,rate,60 pants:blazer,costprice,40 etc i want to read the first line and get... (6 Replies)
Discussion started by: venu
6 Replies

6. Shell Programming and Scripting

Updating a line in a large csv file, with sed/awk?

I have an extremely large csv file that I need to search the second field, and upon matches update the last field... I can pull the line with awk.. but apparently you cant use awk to directly update the file? So im curious if I can use sed to do this... The good news is the field I want to... (5 Replies)
Discussion started by: trey85stang
5 Replies

7. Shell Programming and Scripting

reading a file inside awk and processing line by line

Hi Sorry to multipost. I am opening the new thread because the earlier threads head was misleading to my current doubt. and i am stuck. list=`cat /u/Test/programs`; psg "ServTest" | awk -v listawk=$list '{ cmd_name=($5 ~ /^/)? $9:$8 for(pgmname in listawk) ... (6 Replies)
Discussion started by: Anteus
6 Replies

8. Shell Programming and Scripting

awk script to remove duplicate rows in line

i have the long file more than one ns and www and mx in the line like . i need the first ns record and first www and first mx from line . the records are seperated with tthe ; i am try ing in awk scripting not getiing the solution. ... (4 Replies)
Discussion started by: kiranmosarla
4 Replies

9. Shell Programming and Scripting

Awk not working due to missing new line character at last line of file

Hi, My awk program is failing. I figured out using command od -c filename that the last line of the file doesnt end with a new line character. Mine is an automated process because of this data is missing. How do i handle this? I want to append new line character at the end of last... (2 Replies)
Discussion started by: pinnacle
2 Replies

10. Shell Programming and Scripting

Removal of Duplicate Entries from the file

I have a file which consists of 1000 entries. Out of 1000 entries i have 500 Duplicate Entires. I want to remove the first Duplicate Entry (i,e entire Line) in the File. The example of the File is shown below: 8244100010143276|MARISOL CARO||MORALES|HSD768|CARR 430 KM 1.7 ... (1 Reply)
Discussion started by: ravi_rn
1 Replies
Login or Register to Ask a Question