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That depends entirely on the connection between the co-location and the financial institution, then. The VPN between A and B doesn't make it more secure.

No.
It is only a secure connection from B to C. (That's assuming that your VPN is secure!).

Hard (for me) to guess how you might do this type of connection without getting cut off when you start...

use nawk on Solaris

You will say i am nitpicking but using character class would make the code more reliable (avoid unexpected translation with some locale)

tr '[:upper:]' '[:lower:]' <...

to use the entire file, give tr the entire file.

tr '[A-Z]' '[a-z]' < /export/home/oracle/TST/data.dat > newfile data.dat and newfile should not be the same file, tr doesn't edit in-place.