Need to compare values on two CSV files


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# 1  
Question Need to compare values on two CSV files

Smilie

Hello,
Having a problem with reading two files using awk/nawk, am new to both them.
I need to compare field values between two csv files and arrange for an appropriate output if both the values are equal or not for each feild.

Code:
$cat File1.csv
1979181218.70,2039088797.84,48864040.62,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00
1573820407.52,1536377096.18,673980681.96,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00
405360811.18,502711701.66,625116641.34,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00
$cat File2.csv
1979181218.70,2039088797.84,48864040.62,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00
1573820407.52,1536377096.18,673925056.96,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00
405360811.18,502711701.66,625061016.34,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00



Understood reading values into an array for a single file,
Code:
nawk '
 BEGIN{FS=","}
{for(i=1;i<=NF;i++)
 arr[NR","i] = $i;
{for (col = 1; col <= NF; col++) 
      {printf "%s \t" , arr[NR","col];}
       printf("\n"); }
 ' File1.csv

Code:
1979181218.70   2039088797.84   48864040.62     0.00    0.00    0.00    0.00    0.00    0.00    0.00    0.00    0.00
1573820407.52   1536377096.18   673980681.96    0.00    0.00    0.00    0.00    0.00    0.00    0.00    0.00    0.00
405360811.18    502711701.66    625116641.34    0.00    0.00    0.00    0.00    0.00    0.00    0.00    0.00    0.00

Having problems with the getline concept.Think that is the only way to read a second file.Smilie
Please advice.

# 2  

Code:
paste File1.csv File2.csv | awk -F '\t' '
{
  split($1,a,",")
  split($2,b,",")

  ## compare a[X] and b[X] etc....
}
'

# 3  
Perhaps this is good enough in your case ?
Code:
diff File1.csv File2.csv

# 4  
If you want to persist with (n)awk:

To print lines that are similar:
Code:
awk 'FNR==NR{arr[$0]=1;next} arr[$0]{print}' file1 flile2

To print lines that differ:
Code:
awk 'FNR==NR{arr[$0]=1;next} !arr[$0]{print}' file1 flile2

To output results in two different files:
Code:
awk 'FNR==NR{arr[$0]=1;next} arr[$0]{print > "/tmp/equal"} !arr[$0]{print > "/tmp/diff"} file1 file2'

# 5  
Thanks a lot!

Smilie Thanks for the replies Johnson,scrutinizer and ripat....

Used the paste and split concept,

Code:
paste MTH-tgf_cube.csv MTH-abm_cube.csv | nawk  '
BEGIN {FS="\t";}
{
split($1,a,",")
split($2,b,",")
printf " Comparing Record %s\n", NR;
   for (i=1;i<=12;i++) 
    {
    printf("%s=%d\t", i, a[i]);
    printf("%s=%d\t", i, b[i]);
    printf("Difference %s=%d\n", i, a[i]-b[i]);

    }
}
'

Was using Diff earlier, but needed the difference in field values from two files and not between files.


as for using nawk, Was definitely thinking of using it,had tried to dig-in ,before posting this question.
I still do not get the usage of FNR or using getline Smilie,
What will $0 be during the check here?
If i am not wrong $0 is the whole record of the input,probably a common record for file1 and file2.Would really help if you can explain this.
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