サブコマンドで指定を間違えてもリターンコードが0になっている

[cohama]

$ nextcloud-cli download
NAME:
   nextcloud-cli download - Download remote files or directories

USAGE:
   nextcloud-cli download [command options] FILE [FILE...]

OPTIONS:
   --out value, -o value  set output directory (default: ".")
   --retry value          set max retry count (default: 5)
   --deconflict value     set deconflict strategy (skip/overwrite/newest/error) (default: "error")
   --procs value          set maximum number of processes (default: 10)
   --help, -h             show help (default: false)

$ echo $?
0

大抵のコマンドは引数が足りなかったりした場合は Usage 出すとともに0以外を返す気がします。

$ aws s3 cp
Note: AWS CLI version 2, the latest major version of the AWS CLI, is now stable and recommended for general use. For more information, see the AWS CLI version 2 installation instructions at: https://docs.aws.amazon.com/cli/latest/userguide/install-cliv2.html

usage: aws [options] <command> <subcommand> [<subcommand> ...] [parameters]
To see help text, you can run:

  aws help
  aws <command> help
  aws <command> <subcommand> help
aws: error: the following arguments are required: paths

$ echo $?
2