Linux shell: web-safe variant of a binary RSA signature of base64

Question

In Linux, I have a file 'signature.bin' with a binary RSA signature, and I would like to get a web-safe variant of it of base64.

How can I do it with the shell?

Answer 1

There is a base64 command in the GNU Coreutils. So simply

base64 signature.bin

should do the trick.