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Full Discussion: Find lines with duplicate values in a particular column
Top Forums UNIX for Beginners Questions & Answers Find lines with duplicate values in a particular column Post 303039640 by Chubler_XL on Thursday 10th of October 2019 09:55:30 PM
Old 10-10-2019
On worries, it works like this.

On first occurrence of an new $4 value ($4 in x) will be false so x[$4] is assigned to the record value.

On second occurrence $4 will be in x (we assigned it on first occurrence) and x[$4] will be non-blank so we do print x[$4]
which prints the first value then we do print to print current record and assign x[$4] to blank.

On Third and further occurrences $4 is still in x but the array item is blank now so we just print and assign x[$4] to blank again.


Edit:
One thing to be careful of is that awk will create and array item as soon as it's referenced for example:

Code:
$ awk 'BEGIN { print T["test"]; print ("test" in T) }'

1

Using key in array is safe and does not create an item:
Code:
$ awk 'BEGIN { print ("test" in T); print ("test" in T) }'
0
0

Last edited by Chubler_XL; 10-10-2019 at 11:05 PM..
This User Gave Thanks to Chubler_XL For This Post:
kaktus
 

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LEARN ABOUT LINUX

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
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