I really can't follow the logic of your program: it seems you are reading the file and, for each line read, parse all the lines read so far to check for ID equality. It is certainly not the fastest way to do it.

If I understand the problem, you want to group data from lines with the same ID and then print it in some format. What I'd do is to:

• Define a empty hash
• Read the file line by line
• Parse each line when read and extract the ID and the single data fields
• Add the data read to the hash using as key the ID field. Data should be further structured in a hash using keys like RECTYPE, ASSET, and EXTK?
• When all the file has been read, print the contents of the hash, formatting as you need

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