using via flutter error grind: 7: pub: not found

[ghost]

as per https://dart.dev/tools/pub/cmd :

the standalone pub command is deprecated

simply installing it via flutter (flutter pub global activate grinder)
and then using it, grind generate
(as seen in https://github.com/flutter/samples/tree/master/web/samples_index#generating-the-index )

results in grind: 7: pub: not found

flutter doctor -v

[✓] Flutter (Channel beta, 2.2.0, on Linux, locale en_US.UTF-8)
    • Flutter version 2.2.0 at /home/dym/snap/flutter/common/flutter
    • Framework revision b22742018b (3 weeks ago), 2021-05-14 19:12:57 -0700
    • Engine revision a9d88a4d18
    • Dart version 2.13.0

[✓] Android toolchain - develop for Android devices (Android SDK version 30.0.3)
    • Android SDK at /home/dym/Android/Sdk
    • Platform android-30, build-tools 30.0.3
    • Java binary at: /snap/android-studio/current/android-studio/jre/bin/java
    • Java version OpenJDK Runtime Environment (build 11.0.8+0-b944-P17168821)
    • All Android licenses accepted.

[✓] Chrome - develop for the web
    • Chrome at google-chrome

[✓] Linux toolchain - develop for Linux desktop
    • clang version 6.0.0-1ubuntu2 (tags/RELEASE_600/final)
    • cmake version 3.10.2
    • ninja version 1.8.2
    • pkg-config version 0.29.1

[✓] Android Studio (version 4.2)
    • Android Studio at /snap/android-studio/103/android-studio
    • Flutter plugin can be installed from:
      🔨 https://plugins.jetbrains.com/plugin/9212-flutter
    • Dart plugin can be installed from:
      🔨 https://plugins.jetbrains.com/plugin/6351-dart
    • Java version OpenJDK Runtime Environment (build 11.0.8+0-b944-P17168821)

[✓] Android Studio
    • Android Studio at /snap/android-studio/current/android-studio
    • Flutter plugin can be installed from:
      🔨 https://plugins.jetbrains.com/plugin/9212-flutter
    • Dart plugin can be installed from:
      🔨 https://plugins.jetbrains.com/plugin/6351-dart
    • android-studio-dir = /snap/android-studio/current/android-studio
    • Java version OpenJDK Runtime Environment (build 11.0.8+0-b944-P17168821)

[✓] Connected device (2 available)
    • Linux (desktop) • linux  • linux-x64      • Linux
    • Chrome (web)    • chrome • web-javascript • Google Chrome 91.0.4472.77

• No issues found!

[ghost]

current workaround: add alias pub='flutter pub' to ~/.profile