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)。

After putting vi into command mode, you can type: set number and press Enter to turn line numbering on (see Listing 2).

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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)。

After putting vi into command mode, you can type: set number and press Enter to turn line numbering on (see Listing 2).

youdao