Raise exception on shell command failure?

You can use one of ruby's special variables. The $? (analogous to the same shell script var).

`ls`
if $?.to_s == "0"
  # Ok to go
else
  # Not ok
end

Almost every program sets this var to 0 if everything went fine.

Easiest way would be to create a new function (or redefine an existing one) to call system() and check the error code.

Something like:

old_sys = system

def system(...)
  old_system(...)
  if $? != 0 then raise :some_exception
end

This should do what you want.

Ruby 2.6 adds an exception: argument:

system('ctat nonexistent.txt', exception: true) # Errno::ENOENT (No such file or directory - ctat)

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