What's the equivalent to ${var:-defaultvalue} in fish?

Question

Hello I am trying to translate my .bashrc to fish format almost done, mostly is clear on the documentation but this part is giving me a headache.. is so my gnupg works with

Answer 1

You should not change your login shell until you have a much better understanding of fish syntax and behavior. For example, in fish the equivalent of $$ is %self or $fish_pid depending on which fish version you are using. You should always specify the version of the program you are having problems with.

Assuming you're using fish 2.x that would be written as

if not set -q gnupg_SSH_AUTH_SOCK_by
or test $gnupg_SSH_AUTH_SOCK_by -ne %self
    set -gx SSH_AUTH_SOCK "/run/user/$UID/gnupg/S.gpg-agent.ssh"
end

Also, notice that there is no equal-sign between the var name and value in the set -x.