Error

Error is raised when an external program exits unsuccessfully.

try
  run.sh -c "exit 42"
catch Error: err
  assert_eq $err.rc 42

Error exposes:

• rc: the numeric exit status, or nil if the process did not exit normally
• signal on Unix: the fatal signal number, or nil when not applicable

On Windows, accessing signal raises FieldError.

On Unix, a signaled process reports signal instead of rc:

try
  run.sh -c r"kill -TERM $$"
catch Error: err
  assert_eq $err.rc nil
  assert_eq $err.signal 15

str(err) returns a stable process-failure message such as an exit status or fatal signal description.

Spawn, lookup, and other I/O failures do not raise Error; they raise sys.Error instead.

Inherits

• RuntimeError