对于本篇技巧，我创建了一个玩具式的文件查看应用程序，它可以读取url或本地文件并使用编号的行和一个类似wc的摘要显示读取内容。
For this tip, I created a toy file-viewing application that reads a URL or local file and displays it with numbered lines and a wc-like summary.
我们也会检查某一行是否为空，如果是空的话，则不进行显示和编号。
We also check if a line is blank, and skip showing and numbering it if so. For example, combined with ls we can get
第三行利用文档的编号来删除文档。
ROWNUM：报表中所有行的顺序编号，便于进行引用。
ROWNUM: This sequential numbering of all the rows in the report for reference purposes.
若存在一个可行的编号方法，就在第一行输出'YES'，否则输出'NO'。
The first line of an output should contain YES, if it is possible to find a required numbering, and NO otherwise.
请在这里填上信用证编号、日期、开证行名称等等。
Please fill up here the credit number, the date, the name of the issuing bank, etc.
这些指令将预处理文件中的行重新编号。
These directives renumber the lines of the preprocessed file.
这个设备提供书信这样对每个实数有在编号行的仅有的一对应的点。
This device provides a correspondence such that to each real number there is one and only one corresponding point on the number line.
输出的每一行要包括拨出的号码，每一个话费阶段的分钟数，话费阶段编号以及总费用。并按如下格式输出。
Output will consist of the called number, the time in minutes the call spent in each of the charge categories, the charging step and the total cost in the format shown below.
输出的每一行要包括拨出的号码，每一个话费阶段的分钟数，话费阶段编号以及总费用。并按如下格式输出。
Output will consist of the called number, the time in minutes the call spent in each of the charge categories, the charging step and the total cost in the format shown below.
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