Catching command-line errors using %x

Question

Whenever you want to execute something on the command line, you can use the following syntax:

%x(command to run)

However, I want to catch a

Answer 1

So this doesn't directly answer your question (won't capture the command's output). But instead of trying begin/rescue, you can just check the exit code ($?) of the command:

%x(command to run)
unless $? == 0
   "ack! error occurred"
end

Edit: Just remembered this new project. I think it does exactly what you want:

https://github.com/envato/safe_shell