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Keep the last uniq record only

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# 1  
Old 07-03-2010
Keep the last uniq record only
Hi folks,

Below is the content of a file 'tmp.dat', and I want to keep the uniq record (key by first column). However, the uniq record should be the last record.
Code:
302293022|2|744124889|744124889
302293022|3|744124889|744124889
302293022|4|744124889|744124889
302293022|5|744124889|744124889
302293022|6|744124889|744124889
302293022|7|744124889|744124889
302293022|8|744124889|744124889
302293022|9|744124889|744124889
302293022|10|744124889|744124889
302293022|11|744124889|744124889

Output:
Code:
302293022|11|744124889|744124889

Any ideas... I was playing around with the 'sort' and 'uniq' commands but could not get very far.

Thanks,
CB
Last edited by Franklin52; 07-03-2010 at 01:14 PM.. Reason: Please use code tags
# 2  
Old 07-03-2010
Hi
Not sure, i understood you correctly. If it is always the last record, why not 'tail -1'.

Guru.
# 3  
Old 07-03-2010
If the last record that you wanted to keep always has the highest value in column 2, then:
Code:
sort -t\| -k1,1 -k2,2rn tmp.dat |sort -t\| -mu -k1,1

# 4  
Old 07-05-2010
Code:
awk -F \| '{if ($2>a[$1]) {a[$1]=$2;b[$1]=$0}} END {for (i in a) print b[i]}' tmp.dat

# 5  
Old 07-06-2010
Hi.
Quote:
Originally Posted by guruprasadpr
Hi
Not sure, i understood you correctly. If it is always the last record, why not 'tail -1'.

Guru.
From some notes I made for a uniq-like section of code I wrote long ago, discussing whether, in a sequence of same items (in a specific field), the first or last occurrence is kept and printed:
Quote:
Some versions of uniq on other *nix systems use
the most recent (Solaris), the default is compatibility with
GNU/Linux uniq, which keeps the first occurrence.
cheers, drl
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