Why can't I execute some commands from Process?
Because echo is not a program found on the computer, it is a shell command. Command::new takes in an executable to run as a sub-process.
If you are on windows you can use
Command::new("cmd") .args(&["/C", "echo hello!"]) .spawn() .expect("echo command failed to start");to run the CMD program and /C to pass in a command, in this case echo.
On linux you can use the bash executable.
Command::new("bash") .args(&["-c", "echo hello"]) .spawn() .expect("echo command failed to start");
You need to set the runInShell param to true, like:
var r = await Process.run('echo', ['hello'], runInShell: true); print(r.stdout); //Prints 'hello'From the dart api
If runInShell is true, the process will be spawned through a system shell. On Linux and OS X, /bin/sh is used, while %WINDIR%\system32\cmd.exe is used on Windows.