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。
本文转自hipercomer 51CTO博客，原文链接:http://blog.51cto.com/hipercomer/810333
