[bug-gawk] gawk simple compare not working?

[Dial, Mary]

I’m stumped! Any help is appreciated.

 

I run this simple gawk compare program (below) and it does not return the correct answer. But if a append an ‘x’ to the compare, then it works. Im not sure if this is an gawk bug.

 

I’m using Red Hat Linux 6.6. Both gawk 3.7.1 and 4.1 return the same results

 

Here is the sample input where the 2^nd to last characters are different

File c1

073343000773200000000075

 

File c2

073343000773200000000005

 

Here is the run test run

gawk_test_diff c1 c2

Straight Compare - Lines are the same

Add Char Compare - Lines are different

 

Here is the gawk program gawk_test_diff

#!/bin/ksh

 

old_file=${1}

current_file=${2}

 

gawk -v oldfile=${old_file} \

     -v currentfile=${current_file} \

'BEGIN {

 

# Get a line from the old file

  ofile=getline oldline < oldfile

 

# Get a line from the current file

  cfile=getline currentline < currentfile

 

# While not EOF old or current file

  while ( ofile > 0 || cfile > 0 ) {

 

  # if not EOF old and current file

    if (ofile > 0 && cfile > 0 ) {

                                         

 

    # Compare lines

      if (oldline != currentline) {

        printf("Straight Compare - Lines are different \n")

      }

      else

        printf("Straight Compare - Lines are the same\n")

 

 

    # Compare lines  and add a character

      if ("x"oldline != "x"currentline) {

        printf("Add Char Compare - Lines are different \n")

      }

      else

        printf("Add Char Compare - Lines are the same\n")

 

    # Get another line from the old file

      ofile=getline oldline < oldfile   

 

    # Get another line from the current file

      cfile=getline currentline < currentfile

 

      }

 

  }

  close(oldfile) 

  close(currentfile)

 

}'

 

exit 0

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