如何将命令输出保存到变量

output=`command`
或者
output=$(command)

FOR /F "tokens=*" %%A IN ('command') DO SET output=%%A
或者
SET output=$(command)

import subprocess
output = subprocess.check_output(["command"])

import java.io.BufferedReader;
import java.io.InputStreamReader;

String command = "command";
Process process = Runtime.getRuntime().exec(command);
BufferedReader reader = new BufferedReader(new InputStreamReader(process.getInputStream()));
String line;
StringBuilder output = new StringBuilder();
while ((line = reader.readLine()) != null) {
    output.append(line);
}
reader.close();
String result = output.toString();