001/* 002 * Licensed to the Apache Software Foundation (ASF) under one 003 * or more contributor license agreements. See the NOTICE file 004 * distributed with this work for additional information 005 * regarding copyright ownership. The ASF licenses this file 006 * to you under the Apache License, Version 2.0 (the 007 * "License"); you may not use this file except in compliance 008 * with the License. You may obtain a copy of the License at 009 * 010 * http://www.apache.org/licenses/LICENSE-2.0 011 * 012 * Unless required by applicable law or agreed to in writing, 013 * software distributed under the License is distributed on an 014 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 015 * KIND, either express or implied. See the License for the 016 * specific language governing permissions and limitations 017 * under the License. 018 */ 019package org.apache.reef.util; 020 021import java.io.BufferedReader; 022import java.io.IOException; 023import java.io.InputStreamReader; 024import java.nio.charset.StandardCharsets; 025import java.util.logging.Level; 026import java.util.logging.Logger; 027 028/** 029 * run given command and return the result as string. 030 */ 031public final class CommandUtils { 032 /** 033 * Standard java logger. 034 */ 035 private static final Logger LOG = Logger.getLogger(CommandUtils.class.getName()); 036 037 public static String runCommand(final String command) { 038 final StringBuilder sb = new StringBuilder(); 039 try { 040 final String cmd = OSUtils.isWindows() ? "cmd.exe /c " + command : command; 041 final Process proc = Runtime.getRuntime().exec(cmd); 042 043 try (final BufferedReader input = 044 new BufferedReader(new InputStreamReader(proc.getInputStream(), StandardCharsets.UTF_8))) { 045 String line; 046 while ((line = input.readLine()) != null) { 047 sb.append(line).append('\n'); 048 } 049 } 050 } catch (final IOException ex) { 051 LOG.log(Level.SEVERE, "Error in call: " + command, ex); 052 sb.append(ex); 053 } 054 return sb.toString(); 055 } 056 057 /** 058 * Empty private constructor to prohibit instantiation of utility class. 059 */ 060 private CommandUtils() { 061 } 062}