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POlinux awk comparing two csv files and creating a new file with a flag
 

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  1. POlinux awk comparing two csv files and creating a new file with a flag
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    <p>I have 2 CSV files that i need to compare and get the difference to a newly formatted file. The samples are given below.</p> <p><strong>OLD file</strong></p> <pre><code>DTL,11111111,1111111111111111,11111111111,Y,N,xx,xx DTL,22222222,2222222222222222,22222222222,Y,Y,cc,cc DTL,33333333,3333333333333333,33333333333,Y,Y,dd,dd DTL,44444444,4444444444444444,44444444444,Y,Y,ss,ss DTL,55555555,5555555555555555,55555555555,Y,Y,qq,qq </code></pre> <p><strong>NEW file</strong></p> <pre><code>DTL,11111111,1111111111111111,11111111111,Y,Y,xx,xx DTL,22222222,2222222222222222,22222222222,Y,N,cc,cc DTL,44444444,4444444444444444,44444444444,Y,Y,ss,ss DTL,55555555,5555555555555555,55555555555,Y,Y,qq,qq DTL,77777777,7777777777777777,77777777777,N,N,ee,ee </code></pre> <p><strong>Output file</strong></p> <p>I want to compare the old and new CSV files and to find the changes that has effected in the new file and UPDATE a FLAG to denote these changes</p> <p>U - if the new file record is UPDATED D - if a record existing in the old file is deleted in the new file N - if a record existing in the new file is not available in the old file</p> <p>the sample output file is this.</p> <pre><code>DTL,11111111,1111111111111111,11111111111,Y,Y,xx,xx U DTL,22222222,2222222222222222,22222222222,Y,N,cc,cc U DTL,33333333,3333333333333333,33333333333,Y,Y,dd,dd D DTL,77777777,7777777777777777,77777777777,N,N,ee,ee N </code></pre> <p>I used diff command but it will repeat the UPDATED record too which is not I want.</p> <pre><code> DTL,11111111,1111111111111111,11111111111,Y,N,xx,xx DTL,22222222,2222222222222222,22222222222,Y,Y,cc,cc DTL,33333333,3333333333333333,33333333333,Y,Y,dd,dd --- DTL,11111111,1111111111111111,11111111111,Y,Y,xx,xx DTL,22222222,2222222222222222,22222222222,Y,N,cc,cc 5a5 DTL,77777777,7777777777777777,77777777777,N,N,ee,ee </code></pre> <p>I used an AWK single line command to filter out my records as well</p> <pre><code> awk 'NR==FNR{A[$1];next}!($1 in A)' FS=: old.csv new.csv </code></pre> <p>the problem with this is is doesnt get me the records only belonging to the OLD file. which is </p> <pre><code>DTL,33333333,3333333333333333,33333333333,Y,Y,dd,dd </code></pre> <p>I initiated an driven bash script as well to ahieve this but didnt find much help with a good example.</p> <pre><code> myscript.awk BEGIN { FS = "," # input field seperator OFS = "," # output field seperator } NR &gt; 1 { #flag # N - new record D- Deleted U - Updated id = $1 name = $2 flag = 'N' # This prints the columns in the new order. The commas tell Awk to use the character set in OFS print id,name,flag } &gt;&gt; awk -f myscript.awk old.csv new.csv &gt; formatted.csv </code></pre>
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