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It would be helpful to see the code you have at this point. If you take substr($0,1,14), that takes the first 14 characters of the line, multiple spaces and all.

Set variables with

myvar=(some...

That's not my code. I was just fixing the major problems while retaining as much as possible of the original code.

When the OP says "column 1", some people may think column 1 of the entire line,...

That's not bad, actually - just a couple of issues ...

awk '{
if (substr($1, 1, 1) != "T" )
print
else
print substr ($1, 1, 14) '\"${proc_dt}\"' substr ($1, 24)
}' infile > newfile

Your...

If you have a shell while loop, and within it you are doing:

echo "$LINE" | awk ...

then you are calling awk 20,000 times, opening your output file 20,000 times etc. Instead, do away with the...