org.apache.hadoop.util
Class Shell.ShellCommandExecutor

java.lang.Object
  org.apache.hadoop.util.Shell
      org.apache.hadoop.util.Shell.ShellCommandExecutor

Enclosing class:

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.

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.hadoop.util.Shell

Shell.ExitCodeException, Shell.ShellCommandExecutor

Field Summary

Fields inherited from class org.apache.hadoop.util.Shell

LOG, SET_GROUP_COMMAND, SET_OWNER_COMMAND, SET_PERMISSION_COMMAND, USER_NAME_COMMAND, WINDOWS

Constructor Summary

Shell.ShellCommandExecutor(String[] execString)

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

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

Method Summary

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

Methods inherited from class org.apache.hadoop.util.Shell

execCommand, getExitCode, getGET_PERMISSION_COMMAND, getGROUPS_COMMAND, getProcess, getUlimitMemoryCommand, run, setEnvironment, setWorkingDirectory

Methods inherited from class java.lang.Object

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

Constructor Detail

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)

Method Detail

execute

public void execute()
             throws IOException

Execute the shell command.

Throws:

IOException

getExecString

protected String[] getExecString()

Description copied from class: Shell

return an array containing the command name & its parameters

Specified by:

getExecString in class Shell

parseExecResult

protected void parseExecResult(BufferedReader lines)
                        throws IOException

Description copied from class: Shell

Parse the execution result

Specified by:

parseExecResult in class Shell

Throws:

IOException

getOutput

public String getOutput()

Get the output of the shell command.