Remove underscore and capitalize character after it

Question

I was just wondering if there is a way to replace every underscore in every file in a folder (say .java files) and convert the next character to uppercase, like

• getEmployee_Name → getEmployeeName
• us_employee_name → usEmployeeName

And what if we had id and we wanted to capitalize both I and D, as in

• us_employee_id → usEmployeeID?

I haven't tried anything yet since I'm still learning. Can I do something like s/_/\U\1/g in sed or can I use some script to do this?

Answer 1

Your suggestion 's/_/\U\1/g' is very close. If you have the GNU sed, then the following should work:

sed 's/_\(.\)/\U\1/g'

(I say should, because what you wish for is not always what you want.)

Answer 2

Little more verbose from awk but it will work on all gnu/non-gnu Unix flavors:

> s='get_employee_Name'
> awk -F _ '{printf "%s", $1; for(i=2; i<=NF; i++) printf "%s", toupper(substr($i,1,1)) substr($i, 2); print"";}' <<< "$s"
getEmployeeName