在fish shell中,如何在if语句中放入两个条件？

Question

我想用bash做什么:

> if true; then echo y; else echo n; fi
y
> if false; then echo y; else echo n; fi
n
> if false || true; then echo y; else echo n; fi
y

现在尝试用鱼:

> if true; echo y; else; echo n; end
y
> if false; echo y; else; echo n; end
n

# Here 'or true' are just two arguments for false
> if false or true; echo y; else; echo n; end 
n

# Here 'or true;' is a command inside the if
> if false; or true; echo y; else; echo n; end 
n

# Can't use command substitution instead of a command
> if (false; or true); echo y; else; echo n; end
fish: Illegal command name “(false; or true)”

我怎么能有两个条件if？

Answer 1

另外两种方法:

方法一:

if begin false; or true; end
  echo y
else
  echo n
end

方法二:

false; or true
and echo y
or echo n