wc命令

 

wc命令：

输出文件中的行数，单词数，以及字节数

每行输出一个行的数量，单词的数量以及字节的数量。如果指定的文件数量大于1的话，会输出一个总计的行数。

-c：输出字节计数

-m：输出字符数量

-l：输出行数量

-L：输出最长的行的长度

-w：输出单词的数量

--help：显示帮助信息

--version：显示版本信息

实验：

[lichao@sg01 1]$ cat whilecount.cc

/*

 * This file contains code from "C++ Primer, Fourth Edition", by Stanley B.

 * Lippman, Jose Lajoie, and Barbara E. Moo, and is covered under the

 * copyright and warranty notices given in that book:

 *

 * "Copyright (c) 2005 by Objectwrite, Inc., Jose Lajoie, and Barbara E. Moo."

 *

 *

 * "The authors and publisher have taken care in the preparation of this book,

 * but make no expressed or implied warranty of any kind and assume no

 * responsibility for errors or omissions. No liability is assumed for

 * incidental or consequential damages in connection with or arising out of the

 * use of the information or programs contained herein."

 *

 * Permission is granted for this code to be used for educational purposes in

 * association with the book, given proper citation if and when posted or

 * reproduced.Any commercial use of this code requires the explicit written

 * permission of the publisher, Addison-Wesley Professional, a division of

 * Pearson Education, Inc. Send your request for permission, stating clearly

 * what code you would like to use, and in what specific way, to the following

 * address:

 *

 *      Pearson Education, Inc.

 *      Rights and Contracts Department

 *      75 Arlington Street, Suite 300

 *      Boston, MA 02216

 *      Fax: (617) 848-7047

*/

 

#include <iostream>

 

int main()

{

    int sum = 0, val = 1;

    // keep executing the while until val is greater than 10

    while (val <= 10) {

        sum += val;  // assigns sum + val to sum

        ++val;       // add 1 to val

    }

    std::cout << "Sum of 1 to 10 inclusive is "

              << sum << std::endl;

 

    return 0;

}

[lichao@sg01 1]$ cat add_item.cc

/*

 * This file contains code from "C++ Primer, Fourth Edition", by Stanley B.

 * Lippman, Jose Lajoie, and Barbara E. Moo, and is covered under the

 * copyright and warranty notices given in that book:

 *

 * "Copyright (c) 2005 by Objectwrite, Inc., Jose Lajoie, and Barbara E. Moo."

 *

 *

 * "The authors and publisher have taken care in the preparation of this book,

 * but make no expressed or implied warranty of any kind and assume no

 * responsibility for errors or omissions. No liability is assumed for

 * incidental or consequential damages in connection with or arising out of the

 * use of the information or programs contained herein."

 *

 * Permission is granted for this code to be used for educational purposes in

 * association with the book, given proper citation if and when posted or

 * reproduced.Any commercial use of this code requires the explicit written

 * permission of the publisher, Addison-Wesley Professional, a division of

 * Pearson Education, Inc. Send your request for permission, stating clearly

 * what code you would like to use, and in what specific way, to the following

 * address:

 *

 *      Pearson Education, Inc.

 *      Rights and Contracts Department

 *      75 Arlington Street, Suite 300

 *      Boston, MA 02216

 *      Fax: (617) 848-7047

*/

 

#include <iostream>

#include "Sales_item.h"

 

int main()

{

    Sales_item item1, item2;

 

    std::cin >> item1 >> item2;   //read a pair of transactions

    std::cout << item1 + item2 << std::endl; //print their sum

 

    return 0;

}

说明：以上两个cat输出两个文件的内容。

[lichao@sg01 1]$ wc whilecount.cc add.cc

  45  278 1620 whilecount.cc

  46  282 1620 add.cc

  91  560 3240 total

说明：输出每个文件的行数，单词数以及字节数。同时在结尾处输出总的数量。

[lichao@sg01 1]$ wc -l whilecount.cc add.cc

  45 whilecount.cc

  46 add.cc

  91 total

说明：只输出行号

[lichao@sg01 1]$ wc -L whilecount.cc  add.cc

  79 whilecount.cc

  79 add.cc

  79 total

说明：最长的行的长度

[lichao@sg01 1]$ wc -w whilecount.cc add.cc

 278 whilecount.cc

 282 add.cc

 560 total

说明：输出单词的数量

[lichao@sg01 1]$ wc -l *.cc

   46 add.cc

   47 add_item2.cc

   41 add_item.cc

   59 avg_price.cc

   61 count.cc

   45 forcount.cc

   38 for_ex.cc

   44 item_io.cc

   33 main_only.cc

   41 mysum.cc

   61 userforcount.cc

   45 whilecount.cc

  561 total

说明：可以用来统计源代码的行数

[lichao@sg01 1]$ wc -m *.cc

 1620 add.cc

 1735 add_item2.cc

 1514 add_item.cc

 2132 avg_price.cc

 1938 count.cc

 1579 forcount.cc

 1438 for_ex.cc

 1570 item_io.cc

 1308 main_only.cc

 1551 mysum.cc

 1902 userforcount.cc

 1620 whilecount.cc

19907 total

说明：输出每个文件的字符数量。

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