Changing first letter of a filename to uppercase

Question

How can one change the first letter of a filename to uppercase using a command line?
IS there any command line to do so?

Answer 1

Using the rename command:

rename -n 's/./\U$&/' *

• -n only shows what changes will be made. After you verify the changes, run without -n to actually rename the files.
• s/./\U$&/: substitutes the first character (.) with the uppercase (\U) of whatever was matched ($&).

Example:

$ ls
bar  foo
$ rename -n 's/./\U$&/' *
rename(bar, Bar)
rename(foo, Foo)