Is it possible to make a "file" that can change its output when accessed?
I'm trying to get an email program that doesn't have a random signature feature to use random signatures. All it has is a place to specify a single file as the signature file. Specifying a shell script that will output a random signature doesn't work, I just get part of the shell script as my signature.
Is there some way to create something that will, when accessed as if it were a file, be able to generate different output?