I will make the (hopefully not too wild guess) from this that the name of pathname of the output file you want is the pathname of the input file with the string _123456 appended.

The variable transnum in that awk script is intended to be the transaction number of the transaction that is being copied from the input file to the output file. And, since your transaction numbers are 19 character alphanumeric strings (not six digit decimal strings), setting transnum = 123456 is NOT appropriate.

Changing the:

Code:

print l[i] > file

to:

Code:

print l[i] >> file

means that instead of creating a new output file each time you run this script, it will append all of the transactions requested on the latest run to the output produced on any earlier runs. This would not seem to be a desirable side effect.

Please undo the changes you made and make the following changes instead:
First, change the line:

Code:

	file = FILENAME "_" transnum

to:

Code:

	file = FILENAME "_123456"

and, second, delete the line:

Code:

		close(file)

With these changes, the transaction number printed when a transaction is copied to the output file will again be printed correctly and a single output file will be produced each time the script is run (and will contain only the transactions extracted on that execution of the script). Later executions of the script will replace the contents of that file (if it still exists from an earlier run) or create that file (if it had been removed).