Mapping a data in a file and delete line in source file if data does not exist.


 
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# 1  
Mapping a data in a file and delete line in source file if data does not exist.

Hi Guys,

Please help me with my problem here:
I have a source file:
Code:
1212  23232   343434  ASAS1  4
3212  23232   343434  ASAS2  4
3234  23232   343434  QWQW1  4
1134  23232   343434  QWQW2  4
3212  23232   343434  QWQW3  4

and a mapping file:
Code:
AAA    1    1   ASAS1    AA123
AAA   10   10   ASAS2    AA234
BBB    1    1   QWQW1    QQ123
BBB   24   24   QWQW3    QWSA1

Lets assume that these are all fixed length files.
What I want to happen is if the data in the 4th column of the source file (which is at the 50th-69th positions) does not exist in the 4th column of the mapping file (which is at the 40th-59th position); delete that line in the source file.

This should result like this:
Code:
1212  23232   343434  ASAS1  4
3212  23232   343434  ASAS2  4
3234  23232   343434  QWQW1  4
3212  23232   343434  QWQW3  4

The line:
Code:
1134  23232   343434  QWQW2  4

is deleted since the QWQW2 data is not in the mapping file.

Please help.
Thanks in advance!
# 2  
You can use awk to read the mapping file, storing each unique key (4th column) in an array. Then read the source file and print the line only if the 4th column is a key in the array.

Regards,
Alister
# 3  
Yes exactly my friend, i hope someone can help me in composing a one or two liner awk command since I am a bit worried with the time it would take to process the source file if it has hundred thousands of records in it.
# 4  
the usual paradigm...
Code:
awk 'FNR==NR{m[$4];next} $4 in m' mappingFile sourceFile

This User Gave Thanks to vgersh99 For This Post:
# 5  
Quote:
Originally Posted by vgersh99
the usual paradigm...
Code:
awk 'FNR==NR{m[$4];next} $4 in m' mappingFile sourceFile

Thanks!
I will try this one Smilie
 

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