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First let me say thank you this worked great.

I am new to awk and have been trying to dissect your answer so I can expand it for future uses. Here is what I have come up with. If you have time...

I am trying to delete lines from a file with the sed command.

I have two files. File a.txt 200,000 records. Here is a sample of the file.
File a.txt
2401ABC0212345678 plus 250 characters...