GetExitCodeForRunCommandError tries to read the exit code for the error object returned from running a shell command.

RunCommand runs a shell command and redirects its stdout and stderr to the stdout of the atomic script itself.

RunCommandAndGetOutput runs a shell command and returns its stdout and stderr as a string.

RunCommandAndGetOutputE runs a shell command and returns its stdout and stderr as a string.

RunCommandE runs a shell command and redirects its stdout and stderr to the stdout of the atomic script itself.

Command is a simpler struct for defining commands than Go's built-in Cmd.