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Split files by pairwise combination


 
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Top Forums Shell Programming and Scripting Split files by pairwise combination
# 1  
Split files by pairwise combination

I have 2 files

Code:
 
 $ cat  tmp
 A1 File1a B1 File1b
 A2 File2a B2 File2b
 A1 File1a B3 File3b


and

Code:
 
 $ cat  tmp1
 A1/B1 File3
 A1/B1 File4
 A1/B1 File5
 A1/B1 File6
 A1/B1 File7
 A2/B2 File8
 A2/B2 File9
 A2/B2 File10
 A2/B2 File11
 A2/B2 File12
 A2/B2 File13
 A1/B3 File14
 A1/B3 File15
 A1/B3 File16
 A1/B3 File17



I want to split the files having each A, B and A/B combinations , naming the files according to combinations also hardcoding the values A, B and A/B in a third column

Code:
 
 out_A1_B1
  
 A1 File1a A
 B1 File1b B
 A1/B1 File3 A/B
 A1/B1 File4 A/B
 A1/B1 File5 A/B
 A1/B1 File6 A/B
 A1/B1 File7 A/B
  
  
 out_A2_B2
  
 A2 File2a A
 B2 File2b B
 A2/B2 File8 A/B
 A2/B2 File9 A/B
 A2/B2 File10 A/B
 A2/B2 File11 A/B
 A2/B2 File12 A/B
 A2/B2 File13 A/B
  
 out_A1_B3
  
 A1 File1a A
 B3 File3b B
 A1/B3 File14 A/B
 A1/B3 File15 A/B
 A1/B3 File16 A/B
 A1/B3 File17 A/B





What is wrong with my try

Code:
 
 awk '{print $1 FS $2 FS "A""\n"$3 FS $4 FS "B" >> tmp_$1_$2 ; grep "$1/$3" tmp1 >> tmp_$1_$2 }' tmp  
  
 for file in tmp_*
 do
 awk 'NF==2{$3="A/B"; print $0}' $file > out-$file
 done


Last edited by senhia83; 12-06-2014 at 06:50 PM..
# 2  
You intermix awk and shell, which cannot work. Even if you'd get your approach running, like
Code:
awk    '       {print $1 FS $2 FS "A""\n"$3 FS $4 FS "B" >> "tmp_"$1"_"$3 
                 system ("grep "$1"/"$3 " file2 >> tmp_"$1"_"$3) }' file1

, you had the out_* files with field 3 missing, so overall you would have to run quite some programs in quite some processes, touching files several times, which is not too efficient.


Try
Code:
awk     'NR==FNR        {OUT[$1,$3]=$1 FS $2 FS substr($1,1,1) "\n"
                         OUT[$1,$3]=OUT[$1,$3] $3 FS $4 FS substr($3,1,1) "\n"
                         next}
                        {n=split ($1, T, "/")
                         OUT[T[1],T[2]]=OUT[T[1],T[2]] $1 FS $2 FS substr(T[1],1,1) "/" substr(T[2],1,1) "\n"
                        }
         END            {for (i in OUT) printf "%s",  OUT[i] > "out_" i}
        ' SUBSEP="_" file1 file2
cf out*
out_A1_B1:
A1 File1a A
B1 File1b B
A1/B1 File3 A/B
A1/B1 File4 A/B
A1/B1 File5 A/B
A1/B1 File6 A/B
A1/B1 File7 A/B
out_A1_B3:
A1 File1a A
B3 File3b B
A1/B3 File14 A/B
A1/B3 File15 A/B
A1/B3 File16 A/B
A1/B3 File17 A/B
out_A2_B2:
A2 File2a A
B2 File2b B
A2/B2 File8 A/B
A2/B2 File9 A/B
A2/B2 File10 A/B
A2/B2 File11 A/B
A2/B2 File12 A/B
A2/B2 File13 A/B

That would rum awk only once and also touch any file involved only once. Depending on data sizes, some decent memory might have to be allocated, though.

Last edited by RudiC; 12-07-2014 at 06:03 AM..
This User Gave Thanks to RudiC For This Post:

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