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since you are using some bash syntax, why not do the "cutting" using bash ?

$ ruby -e 'Dir["*"].each{|x| File.rename(x, x[0].downcase+x[1..-1]) if x[/^[A-Z]/] }'

My script doesn't nicely handle the case where the the file already has the proper name. In those cases, mv will complain about target and source being the same file. To prevent that, simply change...

Using less exotic languages (*poke*) :

for file in * ; do
newname="$(echo $file | cut -c 1 | tr 'a-z' 'A-Z')${file#?}"
/bin/mv "$file" "$newname"
done

The cut extracts the first...