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Help with File Data Extract

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# 1  
Old 11-15-2011
Help with File Data Extract
Hello,

Hope you are doing fine. I have been struggling with it for some time now and I would really appreciate your help.

Following is file format:

Code:
Currency,Name,Date,     Term
USD,      ABC, 2011/11/11, T0, S1,   S2,  S3,  S4
   ,        ,            ,T1, 5.6,  2.3, 6.5, 4.5
   ,        ,            ,T2, 5.5,  2.4, 6.4, 4.4
   ,        ,            ,T3, 5.3,  2.3, 6.3, 4.3
Currency,Name,Date,     Term
USD,      XYZ, 2011/11/11, T0, S1,   S2,  S3  
   ,        ,            ,T1, 5.6,  2.3, 6.5 
   ,        ,            ,T2, 5.5,  2.4, 6.4 
.....

Please note this is a comma separated file and no spaces. Tn and Sn are numbers but I have named such for clarity. We need to extract matrix data in following format

Name, Date, Tn, Sn, Rate

i.e.

Code:
ABC, 2011/11/11, T1,S1, 5.6
ABC, 2011/11/11, T1,S2, 2.3
ABC, 2011/11/11, T1,S3, 6.5
ABC, 2011/11/11, T1,S4, 4.5
ABC, 2011/11/11, T2,S1, 5.5
ABC, 2011/11/11, T2,S2, 2.4
ABC, 2011/11/11, T2,S3, 6.5
ABC, 2011/11/11, T2,S4, 4.4
ABC, 2011/11/11, T3,S1, 5.3
ABC, 2011/11/11, T3,S2, 2.3
ABC, 2011/11/11, T3,S3, 6.3
ABC, 2011/11/11, T3,S4, 4.3
XYZ, 2011/11/11, T1,S1, 5.6
XYZ, 2011/11/11, T1,S2, 2.3
XYZ, 2011/11/11, T1,S3, 6.5
XYZ, 2011/11/11, T2,S1, 5.5
XYZ, 2011/11/11, T2,S2, 2.4
XYZ, 2011/11/11, T2,S3, 6.4

Thanks in advance for any help.
# 2  
Old 11-15-2011
nawk -F, -f sr.awk OFS=, myFile.txt.
sr.awk:
Code:
$1 ~ /Currency/ {f++;next}
f { split($0,a, FS);f--;next}
{
   for(i=5;i<=NF;i++)
      print a[2], a[3], $4, a[i], $i
}

# 3  
Old 11-15-2011
Hello vgersh99,

Thanks for your reply. I would like to understand what the code is doing, what is sr.awk?

Is nawk line and code block together? Would appreciate explanation. Thanks
# 4  
Old 11-15-2011
save the posted code in any file - I named mine sr.awk.
And run it as posted: nawk -F, -f sr.awk OFS=, myFile.txt.
Or you can do everything inline:
Code:
nawk -F, '
   $1 ~ /Currency/ {f++;next}
   f { split($0,a, FS);f--;next}
   {
      for(i=5;i<=NF;i++)
         print a[2], a[3], $4, a[i], $i
   }' OFS=, myFile.txt

# 5  
Old 11-15-2011
Hello vergesh99,

Thanks for clarification, I now understand sr.awk means a separate source file.

I am trying to understand the code. So basically you look for the word "Currency" and you stop on the next line after you have found "Currency", correct?

Then you split the line but Quick question what is "f" and what does "f++" and "f--" mean? Move one line forward or one line backward?

Really appreciate your help and time!
# 6  
Old 11-15-2011
Quote:
Originally Posted by srattani
Hello vergesh99,

Thanks for clarification, I now understand sr.awk means a separate source file.

I am trying to understand the code. So basically you look for the word "Currency" and you stop on the next line after you have found "Currency", correct?
correct. we find 'Currency' and set a flag 'f' to be positive (!=0)
Quote:
Then you split the line but Quick question what is "f" and what does "f++" and "f--" mean? Move one line forward or one line backward?
if 'f' is positive (!=0) execute the following code (within {}). Once done, reset 'f' to 0 so that we don't execute the same block of code the follwing lines.
Quote:
Really appreciate your help and time!
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