ruby system command check exit code

Question

I have a bunch of system calls in ruby such as the following and I want to check their exit codes simultaneously so that my script exits out if that command fails.

Answer 1

system returns false if the command has an non-zero exit code, or nil if there is no command.

Therefore

system( "foo" ) or exit

or

system( "foo" ) or raise "Something went wrong with foo"

should work, and are reasonably concise.