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How to compare two columns in two files?


 
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# 1  
Old 07-29-2009
How to compare two columns in two files?

Hello all,

Could someone please let me know shell script or awk solution to compare two columns in two files? Here is the sample -

file1.txt
Code:
abc/xyz,M1234
ddd/lyg,M2345
cnn/tnt,G0123


file2.txt
Code:
A,abc/xyz,kk,dd,zz,DCT,G0123,1
A,ddd/lyg,kk,dd,zz,DCT,M1234,1
A,abc/xyz,kk,dd,zz,DCT,M1234,1
A,cnn/tnt,kk,dd,zz,DCT,G0123,1
A,ddd/lyg,kk,dd,zz,DCT,G0123,1

In above files, I would like to compare files 1 and 2 in file1.txt with fields 2 and 7 in file2.txt. Only if both fields matches, I would like to print/save file2.txt line into new file. So, in above comparison I would like to print out following -

file3.txt
Code:
A,abc/xyz,kk,dd,zz,DCT,M1234,1
A,cnn/tnt,kk,dd,zz,DCT,G0123,1


Could someone please help me with script for this?

Thank you for your help! :-)
# 2  
Old 07-29-2009
awk will do...
Code:
awk -F"," 'FILENAME=="file1"{A[$1$2]=$1$2}
FILENAME=="file2"{if(A[$1$2]==$2$7){print}}' file1 file2

# 3  
Old 07-29-2009
this doesn't generate any output Smilie

---------- Post updated at 06:17 PM ---------- Previous update was at 06:10 PM ----------

Please help!!
# 4  
Old 07-29-2009
sorry I made a small typo error Smilie
this will work...
Code:
awk -F"\," 'FILENAME=="file1"{A[$1$2]=$1$2}
FILENAME=="file2"{if(A[$2$7]){print}}' file1 file2

# 5  
Old 07-30-2009
Code:
nawk -F"," 'NR==FNR{_[$1]=$2} NR!=FNR{if($7==_[$2]) print;}' file1 file2

# 6  
Old 07-30-2009
MySQL

Thank you folks for your help.

vidyadhar85 - Your solution worked perfectly. I went ahead with your solution.

summer_cherry - Thank you for your help too. Somehow the file would not print the first match in test I ran (it would print other matches).

Thanks
# 7  
Old 09-28-2009
vidyadhar85, can you please extend your code to print the entire lines containing the matching columns to a new file (file3) separated by "->"?

for example using above:

file1:
Code:
homer simpson age old_address occupation
marge simpson age old_address occupation
bart simpson old_address occupation
lisa simpson old_address occupation
maggie simpson old_address occupation

file2:
Code:
LISA SIMPSON new_address occupation
maggie simpson new_address occupation
GRANPA simpson age new_address occupation

output (file3):
Code:
lisa simpson old_address occupation -> LISA SIMPSON new_address occupation
maggie simpson old_address occupation -> maggie simpson new_address occupation


Thanks

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