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


 
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# 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:
# 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:
# 19  
Old 03-27-2014
1 in 3x10⁸ I like those odds!
# 20  
Old 03-27-2014
Quote:
Originally Posted by Chubler_XL
1 in 3x10⁸ 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

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