1 /* 2 * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 24 import java.io.File; 25 import java.util.HashMap; 26 import java.util.Map; 27 28 /** 29 * Utility class for finding the command on the current system 30 */ 31 public class UnixCommands { 32 33 private static final String[] paths = {"/bin", "/usr/bin", 34 "/usr/local/bin", "/system/bin", "/sbin", "/usr/bin/sbin", 35 "/usr/local/sbin", "/system/sbin"}; 36 37 private static Map<String,String> nameToCommand = new HashMap<>(16); 38 39 /** 40 * If can find the path to the command, returns the command with the full path. 41 * Otherwise, returns the name of the command. 42 */ 43 public static String cat() { return findCommand("cat"); } 44 public static String sh() { return findCommand("sh"); } 45 public static String kill() { return findCommand("kill"); } 46 public static String sleep() { return findCommand("sleep"); } 47 public static String tee() { return findCommand("tee"); } 48 public static String echo() { return findCommand("echo"); } 49 public static String true_() { return findCommand("true"); } 50 public static String false_() { return findCommand("false"); } 51 52 public static String findCommand(String name) { 53 if (nameToCommand.containsKey(name)) { 54 return nameToCommand.get(name); 55 } 56 String command = findCommand0(name); 57 nameToCommand.put(name, command); 58 return command; 59 } 60 61 private static String findCommand0(String name) { 62 for (String path : paths) { 63 String command = path + '/' + name; 64 if (new File(command).canExecute()) { 65 return command; 66 } 67 } 68 return name; 69 } 70 }