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Here is what I tried.

less FILENAME
less test.sh
#!/bin/bash

echo "Enter Username"
read Username

awk -F: -v var=${Username} '$0 ~ var {gsub(/foo/,"bar",$2); print}' FILENAME

bash...

join works with sorted files.
therefore, both must be sorted prior to the 'join' command.

you may sort to new filenames prior to the 'join', or try to sort in-line
i would recommend sorting to...