"Unary operator expected" with flutter command #15081
Description
Steps to Reproduce
Using flutter command like flutter run in a project, and got the following error: /Users/Hugo/flutter/bin/flutter: line 75: [: !=: unary operator expected.
The instruction stills executing. In example, flutter analyze displays this bash error, but keep analyzing project.
Logs
No issues found! with flutter analyze
Flutter Doctor
$ flutter doctor -v
/Users/Hugo/flutter/bin/flutter: line 75: [: !=: unary operator expected
[✓] Flutter (Channel beta, v0.1.5, on Mac OS X 10.13.4 17E160e, locale fr-FR)
• Flutter version 0.1.5 at /Users/Hugo/flutter
• Framework revision 3ea4d06340 (8 days ago), 2018-02-22 11:12:39 -0800
• Engine revision ead227f118
• Dart version 2.0.0-dev.28.0.flutter-0b4f01f759
[✗] Android toolchain - develop for Android devices
✗ Unable to locate Android SDK.
Install Android Studio from: https://developer.android.com/studio/index.html
On first launch it will assist you in installing the Android SDK components.
(or visit https://flutter.io/setup/#android-setup for detailed instructions).
If Android SDK has been installed to a custom location, set $ANDROID_HOME to that location.
[!] iOS toolchain - develop for iOS devices
✗ Xcode installation is incomplete; a full installation is necessary for iOS development.
Download at: https://developer.apple.com/xcode/download/
Or install Xcode via the App Store.
Once installed, run:
sudo xcode-select --switch /Applications/Xcode.app/Contents/Developer
• ios-deploy 1.9.1
✗ ios-deploy out of date (1.9.2 is required). To upgrade:
brew upgrade ios-deploy
• CocoaPods version 1.4.0
[✗] Android Studio (not installed)
• Android Studio not found; download from https://developer.android.com/studio/index.html
(or visit https://flutter.io/setup/#android-setup for detailed instructions).
[✓] VS Code (version 1.20.1)
• VS Code at /Applications/Visual Studio Code.app/Contents
• Dart Code extension version 2.9.2
! Doctor found issues in 3 categories.
As you can see, I'm running Flutter on macOS 10.13.4 in iTerm 2.
I know my issue can be related to #13822, but Flutter doesn't exit in my case.
It concerns this line in flutter file:
if [ ! -f "$SNAPSHOT_PATH" ] || [ ! -s "$STAMP_PATH" ] || [ `cat "$STAMP_PATH"` != "$revision" ] || [ "$FLUTTER_TOOLS_DIR/pubspec.yaml" -nt "$FLUTTER_TOOLS_DIR/pubspec.lock" ]; then