【Flutterエラー対応】zsh: command not found: flutter

Last login: Tue Aug  9 21:35:40 on console
XXX@tinoMacBook-Air ~ % flutter
zsh: command not found: flutter

export PATH=PATH:/Users/yakiimo/development/flutter/bin
export PATH=/Users/yakiimo/development/flutter/bin
export PATH="$PATH:/Users/yakiimo/development/flutter/bin"

Last login: Tue Aug  9 21:35:40 on console
XXX@tinoMacBook-Air ~ % echo $PATH
PATH=PATH:/Users/yakiimo/development/flutter/bin:
PATH=/Users/yakiimo/development/flutter/bin:
PATH="$PATH:/Users/yakiimo/development/flutter/bin"

export PATH="$PATH:/Users/yakiimo/development/flutter/bin"

Last login: Tue Aug  9 21:35:40 on console
XXX@tinoMacBook-Air ~ % flutter
Manage your Flutter app development.

Common commands:

  flutter create <output directory>
    Create a new Flutter project in the specified directory.

  flutter run [options]
    Run your Flutter application on an attached device or in an emulator.

Usage: flutter <command> [arguments]

Global options:
-h, --help                  Print this usage information.
-v, --verbose               Noisy logging, including all shell commands
                            executed.
                            If used with "--help", shows hidden options. If used
                            with "flutter doctor", shows additional diagnostic
                            information. (Use "-vv" to force verbose logging in
                            those cases.)
-d, --device-id             Target device id or name (prefixes allowed).
    --version               Reports the version of this tool.
    --suppress-analytics    Suppress analytics reporting when this command runs.

Available commands:

Flutter SDK
  bash-completion   Output command line shell completion setup scripts.
  channel           List or switch Flutter channels.
  config            Configure Flutter settings.
  doctor            Show information about the installed tooling.
  downgrade         Downgrade Flutter to the last active version for the current
                    channel.
  precache          Populate the Flutter tool's cache of binary artifacts.
  upgrade           Upgrade your copy of Flutter.

Project
  analyze           Analyze the project's Dart code.
  assemble          Assemble and build Flutter resources.
  build             Build an executable app or install bundle.
  clean             Delete the build/ and .dart_tool/ directories.
  create            Create a new Flutter project.
  drive             Run integration tests for the project on an attached device
                    or emulator.
  format            Format one or more Dart files.
  gen-l10n          Generate localizations for the current project.
  pub               Commands for managing Flutter packages.
  run               Run your Flutter app on an attached device.
  test              Run Flutter unit tests for the current project.

Tools & Devices
  attach            Attach to a running app.
  custom-devices    List, reset, add and delete custom devices.
  devices           List all connected devices.
  emulators         List, launch and create emulators.
  install           Install a Flutter app on an attached device.
  logs              Show log output for running Flutter apps.
  screenshot        Take a screenshot from a connected device.
  symbolize         Symbolize a stack trace from an AOT-compiled Flutter app.

Run "flutter help <command>" for more information about a command.
Run "flutter help -v" for verbose help output, including less commonly used
options.