Unexpected result comparing values of rows and columns in two text files

问题

This is related to one of my previous question: How to compare values of rows and columns of two text files in bash?

file1.txt (with special characters: cat -vet file1.txt)

Name  Col1  Col2  Col3^M$  
-----------------------^M$ 
row1  1     4     7^M$         
row2  2     5     8^M$          
row3  3     6     9$

file2.txt (with special characters: cat -vet file2.txt)

Name  Col1  Col2  Col3^M$   
-----------------------^M$         
row1  1     4     7^M$ 
row2  2     5     999$

I have somewhat figured out a way to compare two files. But for some reason it is not giving me the result that I want. Here is the code I use to compare the files.

awk '
FNR < 2 { next }
FNR == NR {
    for (i = 2; i <= NF; i++) 
    {
        a[i,$1] = $i; 
    }    
    b[$1];
    next;

}
($1 in b) {
   for (i = 2; i <= NF; i++) 
   {
      if (a[i,$1] == $i) 
          printf("%s->Col%d: %d vs %d: Equal\n", $1, i-1, a[i,$1], $i);
      else 
          printf("%s->Col%d: %d vs %d: Not Equal\n", $1, i-1, a[i,$1], $i);
   }
} ' file1.txt file2.txt

Expected result:

row2->Col1: 1 vs 1: Equal
row2->Col2: 4 vs 4: Equal
row2->Col3: 7 vs 7: Equal
row1->Col1: 2 vs 2: Equal
row1->Col2: 5 vs 5: Equal
row1->Col3: 8 vs 999: Not Equal

Actual result:

row2->Col1: 1 vs 1: Equal
row2->Col2: 4 vs 4: Equal
row2->Col3: 0 vs 7: Not Equal
row1->Col1: 2 vs 2: Equal
row1->Col2: 5 vs 5: Equal
row1->Col3: 0 vs 999: Not Equal

Does anyone know why lines 3 and 6 of the actual result are comparing with 0 (not supposed to do so)?

回答1:

Special thanks to @jaypal for helping me solve the problem. The problem was that these text files were created in MS-DOS and had to be converted to Unix format in order to be executed in Linux or Unix environment. So before executing the segment of code from the question above, I had to use this command: dos2unix file1.txt

来源：https://stackoverflow.com/questions/24316140/unexpected-result-comparing-values-of-rows-and-columns-in-two-text-files

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awk

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comparison