We also check if a line is blank, and skip showing and numbering it if so. For example, combined with ls we can get
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。
One of the options you can set is number, which turns line numbering on and off (see Listing 1).
可以设置的选项之一是number，它的作用是打开和关闭行号(见清单1)。
After putting vi into command mode, you can type: set number and press Enter to turn line numbering on (see Listing 2).
让vi进入命令模式之后，可以输入：setnumber并按回车来打开行号(见清单2)。
Another useful stack to look at is that of the command-line arguments to a Rexx script. For example, we might want to execute an arbitrary command in our numbering utility, not always ls.
另一个值得说明的有用栈是rexx脚本的命令行参数。
The first line of an output should contain YES, if it is possible to find a required numbering, and NO otherwise.
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'。
When this option is cleared, for example, to facilitate the use of line numbering, you can scroll to the right to see the ends of long lines.
例如，当清除此选项时，可以加强行号的使用，您可以卷动到右边以便查看长文字行的结尾部分。
When this option is cleared, for example, to facilitate the use of line numbering, you can scroll to the right to see the ends of long lines.
例如，当清除此选项时，可以加强行号的使用，您可以卷动到右边以便查看长文字行的结尾部分。
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