[Sussex] Bash string substitution

[Ronan Chilvers]

For all you Bashers out there, what's a quick way to substitute 1
character with 2 in a given string.  I have a list of filenames I want
to rename via a script, eg:

A-012345.txt

becomes

BC-012345.txt

or

2-A-789.txt

becomes

2-BC-789.txt

Using tr doesn't work because it only substitutes 1 for 1 (ie: A
becomes B not BC).

Any ideas?

Ronan
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