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Filter uniq field values (non-substring)

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# 1  
Old 05-07-2014
Filter uniq field values (non-substring)
Hello, I want to filter column based on string value. All substring matches are filtered out and only unique master strings are picked up.
infile:
Code:
1 abcd
2 abc
3 abcd
4 cdef
5 efgh
6 efgh
7 efx
8 fgh

Outfile:
Code:
1 abcd
4 cdef
5 efgh
7 efx

I have tried
Code:
awk '!a[$2]++; match(a[$2], $2)>0' infile

Apparently the match part is wrong that should be a loop to go through all the members already saved in a[].
Code:
awk '!a[$2]++; END{
for (i in a)
{
if ( match(a, $2)>0) {
print $0;
}
}
}' infile

but this is not working.
Thanks a lot!
Last edited by yifangt; 05-07-2014 at 06:30 PM.. Reason: change code
# 2  
Old 05-07-2014
I think that's what you're after:
Code:
awk '{for(i in a) if(i ~ $2 )next;a[$2]}1' myFile

This User Gave Thanks to vgersh99 For This Post:
yifangt
# 3  
Old 05-07-2014
Exactly! Thanks a lot!
# 4  
Old 05-07-2014
Quote:
Originally Posted by vgersh99
I think that's what you're after:
Code:
awk '{for(i in a) if(i ~ $2 )next;a[$2]}1' myFile

That approach only tests potential substrings against some of the strings which precede it. As a consequence, the first string in the file is always included.

Consider the result if the first line in the OP's data sample were deleted.

Regards,
Alister
# 5  
Old 05-07-2014
Alister, I did not get full of your point. Could you give any example? Thanks
# 6  
Old 05-07-2014
Quote:
Originally Posted by alister
That approach only tests potential substrings against some of the strings which precede it. As a consequence, the first string in the file is always included.

Consider the result if the first line in the OP's data sample were deleted.

Regards,
Alister
very good point - thank you!
here's a diff approach:
Code:
awk '{for(i in a) if ($2 ~ i) delete a[i];a[$2]=$0}END {for (i in a) print a[i]}' myFile

# 7  
Old 05-07-2014
Did a test:
Code:
awk '{for(i in a) if ($2 ~ i) delete a[i];a[$2]=$1}END {for (i in a) print a[i],i}' infile

8 fgh
3 abcd
6 efgh
4 cdef
7 efx

8 fgh is a substring of 6 efgh More ideas?
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