Find duplicates in the first column of text file Post: 302432826

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Top Forums Shell Programming and Scripting Find duplicates in the first column of text file Post 302432826 by gameboy87 on Monday 28th of June 2010 04:46:17 AM

06-28-2010

Registered User

what is meant by "First time process" and "Second time process" ?

I will try out & comment here quicky ASAP b'coz there is a problem in my machine.

---------- Post updated at 08:05 PM ---------- Previous update was at 07:52 PM ----------

Quote:

Originally Posted by alister

A single-pass version (increased ram requirement since all lines of the file are stored for END use):

Code:

 awk '{a[NR]=$0; a[NR,"k"]=$1; k[$1]++} END {for (i=1; i<=NR; i++) if (k[a[i,"k"]] > 1) print a[i]}' data

Regards,
Alister

Can u explain what's the code is doing?

---------- Post updated 06-28-10 at 02:16 PM ---------- Previous update was 06-27-10 at 08:05 PM ----------

Quote:

Originally Posted by guruprasadpr

Hi
First time, when the file is processed, it takes the count of 1st column duplicates. Second time, when it is processed, it starts printing those lines which has count more than 1.

btw, did it work?

Guru.

It worked ! thanks...But i need to find the count of it's occurence

Code:

awk ' { per[$1] += 1}
END { for (i in per)
print i, per[i] } ' dupli.txt > dupli_count.txt

in the above code i need to print the Total count as "Sum=????" (i need to count 2nd column.)

Last edited by Scott; 06-28-2010 at 05:47 AM.. Reason: Code tags, please...

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LEARN ABOUT FREEBSD

colrm

COLRM(1)						    BSD General Commands Manual 						  COLRM(1)

NAME

     colrm -- remove columns from a file

SYNOPSIS

     colrm [start [stop]]

DESCRIPTION

     The colrm utility removes selected columns from the lines of a file.  A column is defined as a single character in a line.  Input is read
     from the standard input.  Output is written to the standard output.

     If only the start column is specified, columns numbered less than the start column will be written.  If both start and stop columns are spec-
     ified, columns numbered less than the start column or greater than the stop column will be written.  Column numbering starts with one, not
     zero.

     Tab characters increment the column count to the next multiple of eight.  Backspace characters decrement the column count by one.

ENVIRONMENT

     The LANG, LC_ALL and LC_CTYPE environment variables affect the execution of colrm as described in environ(7).

EXIT STATUS

     The colrm utility exits 0 on success, and >0 if an error occurs.

SEE ALSO

     awk(1), column(1), cut(1), paste(1)

HISTORY

     The colrm command appeared in 3.0BSD.

BSD
								  August 4, 2004							       BSD