How can I swap uppercase and lowercase alternatively?

Question

I\'m writing a program that can convert uppercase into lowercase and lowercase into uppercase alternatively. Here are some examples.

abcde -> aBcDe

Answer 1

You didn't say what shell you want to use. Depending on the shell, this can be complicated or easy.

For example, in Zsh, it is very easy:

myvar="abcd"
myvar_uppercase=${(U)myvar}