dart run

Learn to run programs with dart run.

The dart run command

To run a Dart program, type dart run file.dart in the terminal. This command compiles the file and runs it immediately.

If the Dart SDK is installed, the dart command is on the PATH. If not, install the Flutter SDK first (Dart comes with it).

If an error occurs during execution, Dart shows it with a line number. If there is no error, the terminal returns to the command line when the program finishes.

Output and stdout

When the program runs, everything you write with print goes to the standard output stream (stdout). The terminal shows this stream on the screen.

If the program prints an error message, it usually goes to the standard error stream (stderr); most terminals show it in red.

Later we will see stdout.write and stderr.write too; they write without adding a newline.

Exercise Ready to run message

Write a program that prints Terminal ready when run. Do not forget the void main() skeleton.

Show example solution

void main() {
  print("Terminal ready");
}

Test yourself

Command to run merhaba.dart?
```
dart run merhaba.dart
```
- dart start merhaba.dart
- dart run merhaba.dart
- run dart merhaba
- dart execute merhaba
Show answer

dart run merhaba.dart — The dart run command compiles and runs the file.

Run subcommand

dart ____ merhaba.dart

Show answer

dart run merhaba.dart

Terminal concepts

dart run

Runs the file
.dart

Dart file extension
stdout

Output stream
print

Writes to screen

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