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c8640d1f68
Increase the range of characters that get substituted by '_' so the shell doesn't complain about illegal variable names. Primarily done to catch '.' and '-' but who knows what funnies will appear in i/f names. It's a shame that busybox ash doesn't understand :alnum: Signed-off-by: Kevin Darbyshire-Bryant <ldir@darbyshire-bryant.me.uk>