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Sort and Unique in Perl

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# 1  
Old 02-08-2008
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!
# 2  
Old 02-08-2008
read the file line by line and use a hash to get the unique values of the 3rd column.
# 3  
Old 02-08-2008
Quote:
Originally Posted by KevinADC
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.
# 4  
Old 02-08-2008
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
# 5  
Old 02-08-2008
Quote:
Originally Posted by rvegmond
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!
# 6  
Old 02-08-2008
read the file
split the record
use the third field
populate in a hash => this would maintain uniqueness
when displaying use sort keys %hash
# 7  
Old 02-08-2008
Quote:
Originally Posted by rvegmond
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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