A file on the system ahs been lost, but the latest version is on a mksysb tape. The file is extracted from this mksysb tape by loading the tape. Which of the following indicates where the tape will be skipped forward?()A.Third image, and resoting the file

题目

A file on the system ahs been lost, but the latest version is on a mksysb tape. The file is extracted from this mksysb tape by loading the tape. Which of the following indicates where the tape will be skipped forward?()

A.Third image, and resoting the file with the tar command

B.Third image, and restoring the file with the dd command

C.Fourth image, and restoring the file with the restore command

D.Fourth image followed by the tar command


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  • 第1题:

    JAVA File类执行下面这段程序为什么会出现异常 File file=new File(args[0]); 这句是什么意思??

    import java.io.*;

    import java.util.*;

    public class FileClass {

    /**

     * @param args

     */

    public static void main(String[] args) {

    // TODO Auto-generated method stub

    try{

    File file=new File(args[0]);

    System.out.println(args[0]+"文件");

    if(file.isFile()){

    //是否为文件

    System.out.print(file.canRead()?"可读":"不可读");

    System.out.print(file.canWrite()?"可写":"不可写");

    System.out.print(file.length()+"字节");//注意不能调用数组类型 File[] 的 length()例:File[] files=file.listFiles();不可以这么调用filess.length()

    }

    else{

    //列出所有文件及目录

    File[] files=file.listFiles();

    ArrayList<File> fileList=new ArrayList<File>();

    for(int i=0;i<files.length;i++){

    //先列出目录

    if(files[i].isDirectory()){

    //是否为目录

    //取得路径名

    System.out.println("路径"+"[  "+files[i].getPath()+"  ]");

    }

    else{

    //文件先存入fileList,待会再列出

    fileList.add(files[i]);

    }

    }

    //列出文件

    for(File f:fileList){

    System.out.println(f.toString());

    }

    System.out.println();

    }

    }

    catch(ArrayIndexOutOfBoundsException e){

    System.out.println("using:java FileDemo pathname");

    }

    }

    }

    结果:using:java FileDemo pathname

    是不是创建的对象所代表的文件没有被创建成功


     

    File file=new File(args[0]); 就是创建一个args[0]所指文件路径的文件对象。出现异常的原因是:你把args[0]作为文件路径,而你运行时又没有指定。

     

  • 第2题:

    阅读FORTRAN程序:
    OPEN(8,FILE=FILE2 DAT,STATUS=NEW)
    DO 10 I=1,3
    WEITE(8,(4I4)JI+I,J=1,4)
    10 CONTINUE
    CLOSE(8)
    END
    程序运行后,数据文件FILE2,DAT的内容是:


    答案:A
    解析:

  • 第3题:

    .NET框架中有不少与文件I/O相关的类型,如驱动器、目录、文件、流、读写器等,属于System.File名称空间。


    System.IO

  • 第4题:

    TheadministratorwantstobackuptheexistingVIOserversoftwareanditscurrentconfigurationbeforeapplyinganupdate.WhatcommandwilltheadministratorusetobackuptheVIOserversoftwaresothatthebackupcanberestoredfromaNetworkInstallationManager(NIM)serveroraHardwareManagementConsole(HMC)?()

    A.mksysb-tvio/mountpoint

    B.backupios-file/mountpoint

    C.mksysb-i/mountpoint/vio.mksysb

    D.backupios-mksysb-file/mountpoint/vio.mksysb


    参考答案:B

  • 第5题:

    请解释R函数getwd()、setw()的作用,以及system.file(package = "base")的含义。


    A

  • 第6题:

    下面能完成一次性创建名字分别为file01、file02、file03、file04、file05、file06、file07、file08、file09、file10十个空文件的命令是()。

    A.touch file01 file02 file03 file04 file05 file06 file07 file08 file09 file10#B.touch file{01..10}#C.touch {file01..file10}#D.touch file{001..10}
    {};dict(([1,2],[3,4]));{1:2}