I found them:
- find pub.dart for 'exit_codes' to see which constants are used
- constant values are defined here: (copied from exit_codes.dart )
// Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file // for details. All rights reserved. Use of this source code is governed by a // BSD-style license that can be found in the LICENSE file. /// Exit code constants. From [the BSD sysexits manpage][manpage]. Not every /// constant here is used, even though some of the unused ones may be /// appropriate for errors encountered by pub. /// /// [manpage]: http://www.freebsd.org/cgi/man.cgi?query=sysexits library pub.exit_codes; /// The command completely successfully. const SUCCESS = 0; /// The command was used incorrectly. const USAGE = 64; /// The input data was incorrect. const DATA = 65; /// An input file did not exist or was unreadable. const NO_INPUT = 66; /// The user specified did not exist. const NO_USER = 67; /// The host specified did not exist. const NO_HOST = 68; /// A service is unavailable. const UNAVAILABLE = 69; /// An internal software error has been detected. const SOFTWARE = 70; /// An operating system error has been detected. const OS = 71; /// Some system file did not exist or was unreadable. const OS_FILE = 72; /// A user-specified output file cannot be created. const CANT_CREATE = 73; /// An error occurred while doing I/O on some file. const IO = 74; /// Temporary failure, indicating something that is not really an error. const TEMP_FAIL = 75; /// The remote system returned something invalid during a protocol exchange. const PROTOCOL = 76; /// The user did not have sufficient permissions. const NO_PERM = 77; /// Something was unconfigured or mis-configured. const CONFIG = 78;