org.apache.hadoop.util

类 Shell.ShellCommandExecutor

java.lang.Object

org.apache.hadoop.util.Shell

org.apache.hadoop.util.Shell.ShellCommandExecutor

封闭类:

Shell

public static class Shell.ShellCommandExecutor
extends Shell

A simple shell command executor. ShellCommandExecutorshould be used in cases where the output of the command needs no explicit parsing and where the command, working directory and the environment remains unchanged. The output of the command is stored as-is and is expected to be small.

嵌套类概要

从类继承的嵌套类/接口 org.apache.hadoop.util.Shell

Shell.ExitCodeException, Shell.ShellCommandExecutor

字段概要

从类继承的字段 org.apache.hadoop.util.Shell

LOG, SET_GROUP_COMMAND, SET_OWNER_COMMAND, SET_PERMISSION_COMMAND, timeOutInterval, ULIMIT_COMMAND, USER_NAME_COMMAND, WINDOWS

构造器概要

构造器

构造器和说明
Shell.ShellCommandExecutor(String[] execString)
Shell.ShellCommandExecutor(String[] execString, File dir)
Shell.ShellCommandExecutor(String[] execString, File dir, Map<String,String> env)
Shell.ShellCommandExecutor(String[] execString, File dir, Map<String,String> env, long timeout) Create a new instance of the ShellCommandExecutor to execute a command.

方法概要

方法

限定符和类型	方法和说明
void	execute() Execute the shell command.
protected String[]	getExecString() return an array containing the command name & its parameters
String	getOutput() Get the output of the shell command.
protected void	parseExecResult(BufferedReader lines) Parse the execution result
String	toString() Returns the commands of this instance.

从类继承的方法 org.apache.hadoop.util.Shell

execCommand, execCommand, execCommand, getExitCode, getGET_PERMISSION_COMMAND, getGroupsCommand, getGroupsForUserCommand, getProcess, getUlimitMemoryCommand, getUlimitMemoryCommand, getUsersForNetgroupCommand, isTimedOut, run, setEnvironment, setWorkingDirectory

从类继承的方法 java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

构造器详细资料

Shell.ShellCommandExecutor

public Shell.ShellCommandExecutor(String[] execString)

Shell.ShellCommandExecutor

public Shell.ShellCommandExecutor(String[] execString,
                          File dir)

Shell.ShellCommandExecutor

public Shell.ShellCommandExecutor(String[] execString,
                          File dir,
                          Map<String,String> env)

Shell.ShellCommandExecutor

public Shell.ShellCommandExecutor(String[] execString,
                          File dir,
                          Map<String,String> env,
                          long timeout)

Create a new instance of the ShellCommandExecutor to execute a command.

参数:

execString - The command to execute with arguments

dir - If not-null, specifies the directory which should be set as the current working directory for the command. If null, the current working directory is not modified.

env - If not-null, environment of the command will include the key-value pairs specified in the map. If null, the current environment is not modified.

timeout - Specifies the time in milliseconds, after which the command will be killed and the status marked as timedout. If 0, the command will not be timed out.

方法详细资料

execute

public void execute()
             throws IOException

Execute the shell command.

抛出:

IOException

getExecString

protected String[] getExecString()

从类复制的说明: Shell

return an array containing the command name & its parameters

指定者:

getExecString 在类中 Shell

parseExecResult

protected void parseExecResult(BufferedReader lines)
                        throws IOException

从类复制的说明: Shell

Parse the execution result

指定者:

parseExecResult 在类中 Shell

抛出:

IOException

getOutput

public String getOutput()

Get the output of the shell command.

toString

public String toString()

Returns the commands of this instance. Arguments with spaces in are presented with quotes round; other arguments are presented raw

覆盖:

toString 在类中 Object

返回:

a string representation of the object.