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at the top of your script causes the parser (ie bash) to show you exactly what its reading and what it generates ie debugs your code; highly informative.
You do need line-by-line reading, hence using a while loop with input defined at the end.
A for loop like that defaults to supplying input a as a separate item for each space separated field.
You can set the IFS, but be careful to set it only where you need it
for rec in $(cat file)
Sorry ... didn't get back to a computer until now, but I see chrism01 has provided the good oil on -xv. Also, apologies if I implied age, I was more referring to your age
at the site and thought you may have come across this switch / setting previously
I am also pro the while loop for reading files but after applying the switches mentioned you will see why the current process is still flawed.