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Compare - 1st col of file

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# 1  
Old 09-14-2009
Question Compare - 1st col of file
Hi,

I have two different files, one has two columns and other has only one column. I would like to compare the first column in the first file with the data in the second file and write a third file with the data that is not present is not common to them.

Code:
First file:
NEIS0MDL-00022|060406043A
NEIS2FTE-00111|060406043A
NEIS2FTE-00112|060406043A
NEIS2FTE-00113|060406043A
NEIS2FTE-00114|060406043A
NEIS2FTE-00115|060406043A

Second File:
NEIS0MDL-00022
NEIS2FTE-00111
NEIS2FTE-00112
NEIS2FTE-00113
NEIS2FTE-00114
NEIS2FTE-211

Third File:
NEIS2FTE-211
NEIS2FTE-00115

Kindly help me to achieve the above.

Thanks in Advance,

Regards,
# 2  
Old 09-14-2009
Code:
nawk -F'|' 'FNR==NR {f1[$1];next} !($1 in f1)' file1 file2

# 3  
Old 09-14-2009
Hi thanks for the reply.

With the above command, it is writing the output with the data from second file(single column file) that is not present in first file. It is missing the data that are not common but present in first file(two column file).
# 4  
Old 09-14-2009
You don't need to use awk or nawk. It is like killing mosquito with a sledge hammer.
Code:
cat file1 file2 | cut -f1 -d \| | sort | uniq -u

# 5  
Old 09-14-2009
Quote:
Originally Posted by swame_sp
Hi thanks for the reply.

With the above command, it is writing the output with the data from second file(single column file) that is not present in first file. It is missing the data that are not common but present in first file(two column file).
this is what your sample (third) file is.
Please provide a desired/correct output given your 2 sample files.
# 6  
Old 09-14-2009
Quote:
Originally Posted by gch
You don't need to use awk or nawk. It is like killing mosquito with a sledge hammer.
Code:
cat file1 file2 | cut -f1 -d \| | sort | uniq -u

I think this is working fine, but could you please explain it. Does the "sort" modifies the order of display?

---------- Post updated at 12:04 PM ---------- Previous update was at 12:02 PM ----------
Quote:
Originally Posted by vgersh99
this is what your sample (third) file is.
Please provide a desired/correct output given your 2 sample files.
Still the desired output is same, the third file is expected to have data that are not common to both. The data 211 and 0015 are not common so they are in the third file. Kindly let me know if I'm not clear.
# 7  
Old 09-14-2009
Quote:
Originally Posted by gch
You don't need to use awk or nawk. It is like killing mosquito with a sledge hammer.
Code:
cat file1 file2 | cut -f1 -d \| | sort | uniq -u

But the use of 4 external programs is not the most efficient way, try this:

Code:
awk -F"|" 'NR==FNR{a[$1];next}
$1 in a{a[$1]++;next}
{print}
END{for(i in a){if(!a[i]){print i}}}
' Firstfile Secondfile
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