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Old 02-07-2008
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Sort and Unique in Perl
Hi,

May I know, if a pipe separated File is large, what is the best method to calculate the unique row count of 3rd column and get a list of unique value of the 3rdcolum?

Thanks in advance!
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Old 02-08-2008
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read the file line by line and use a hash to get the unique values of the 3rd column.
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Old 02-08-2008
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Quote:
Originally Posted by KevinADC View Post
read the file line by line and use a hash to get the unique values of the 3rd column.
Could you kindly explain with one simple example.
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Old 02-08-2008
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Maybe realy simple:

cat $file|awk -F\| '{print $3}'|sort -u

(I think some awk guru can do it with less commands)...

I saw to late you meant perl.. sorry
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Old 02-08-2008
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Quote:
Originally Posted by rvegmond View Post
Maybe realy simple:

cat $file|awk -F\| '{print $3}'|sort -u

(I think some awk guru can do it with less commands)...
I can handle with cut, sort -u, and wc commands.

But looking for perl methods!
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Old 02-08-2008
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read the file
split the record
use the third field
populate in a hash => this would maintain uniqueness
when displaying use sort keys %hash
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Old 02-08-2008
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Join Date: Mar 2005
Location: Large scale systems...
Posts: 2,442
Quote:
Originally Posted by rvegmond View Post
Maybe realy simple:

cat $file|awk -F\| '{print $3}'|sort -u

(I think some awk guru can do it with less commands)...

I saw to late you meant perl.. sorry
Code:
awk -F"|" '{ print $3 }' file | sort -u
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