Shell { public static String[] getCheckProcessIsAliveCommand(String pid) { return getSignalKillCommand(0, pid); } protected  Shell(); protected  Shell(long interval); protected  Shell(long interval, boolean redirectErrorStream); @Deprecated static boolean isJava7OrAbove(); static boolean isJavaVersionAtLeast(int version); static void checkWindowsCommandLineLength(String...commands); static String[] getGroupsCommand(); static String[] getGroupsForUserCommand(final String user); static String[] getGroupsIDForUserCommand(final String user); static String[] getUsersForNetgroupCommand(final String netgroup); static String[] getGetPermissionCommand(); static String[] getSetPermissionCommand(String perm, boolean recursive); static String[] getSetPermissionCommand(String perm,
                                                 boolean recursive,
                                                 String file); static String[] getSetOwnerCommand(String owner); static String[] getSymlinkCommand(String target, String link); static String[] getReadlinkCommand(String link); static String[] getCheckProcessIsAliveCommand(String pid); static String[] getSignalKillCommand(int code, String pid); static String getEnvironmentVariableRegex(); static File appendScriptExtension(File parent, String basename); static String appendScriptExtension(String basename); static String[] getRunScriptCommand(File script); static String getHadoopHome(); static File getQualifiedBin(String executable); static String getQualifiedBinPath(String executable); static boolean hasWinutilsPath(); static String getWinUtilsPath(); static File getWinUtilsFile(); static boolean checkIsBashSupported(); String getEnvironment(String env); Process getProcess(); int getExitCode(); Thread getWaitingThread(); boolean isTimedOut(); static String execCommand(String ... cmd); static String execCommand(Map<String, String> env, String[] cmd,
      long timeout); static String execCommand(Map<String,String> env, String ... cmd); static void destroyAllShellProcesses(); static Set<Shell> getAllShells(); static Long getMemlockLimit(Long ulimit); static final Logger LOG; static final String SYSPROP_HADOOP_HOME_DIR; static final String ENV_HADOOP_HOME; static final int WINDOWS_MAX_SHELL_LENGTH; @Deprecated
  static final int WINDOWS_MAX_SHELL_LENGHT; static final String USER_NAME_COMMAND; static final Object WindowsProcessLaunchLock; static final OSType osType; static final boolean WINDOWS; static final boolean SOLARIS; static final boolean MAC; static final boolean FREEBSD; static final boolean LINUX; static final boolean OTHER; static final boolean PPC_64; static final String ENV_NAME_REGEX; static final String SET_PERMISSION_COMMAND; static final String SET_OWNER_COMMAND; static final String SET_GROUP_COMMAND; static final String LINK_COMMAND; static final String READ_LINK_COMMAND; @Deprecated
  static final String WINUTILS; static final boolean isSetsidAvailable; static final String TOKEN_SEPARATOR_REGEX; }
@Test public void testGetCheckProcessIsAliveCommand() throws Exception { String anyPid = "9999"; String[] checkProcessAliveCommand = getCheckProcessIsAliveCommand( anyPid); String[] expectedCommand; if (Shell.WINDOWS) { expectedCommand = new String[]{getWinUtilsPath(), "task", "isAlive", anyPid }; } else if (Shell.isSetsidAvailable) { expectedCommand = new String[] { "bash", "-c", "kill -0 -- -'" + anyPid + "'"}; } else { expectedCommand = new String[] {"bash", "-c", "kill -0 '" + anyPid + "'" }; } Assert.assertArrayEquals(expectedCommand, checkProcessAliveCommand); }