使用sed插入一行到一个空文件中

[PonyCheng2019]

使用touch创建一个空文件，如何使用sed向这个文件中插入新行呢，我发现只要文件是空的，sed好像不管用了啊。
请大家指导指导，谢谢！

[PonyCheng2019]

引用 2 楼 ljc007 的回复:

可以考虑不用touch，改成别的命令：

echo "" >a.txt

偶然发现的，当时用echo替代了，thank you...

[ljc007]

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[ljc007]

Sed is a stream editor. A stream editor is used to perform basic text transformations on an input stream (a file or input from a pipeline). While in some ways similar to an editor which permits scripted edits (such as ed), sed works by making only one pass over the input(s), and is consequently more efficient. But it is sed’s ability to filter text in a pipeline which particularly distin- guishes it from other types of editors. 它需要有输入

[ljc007]

可以考虑不用touch，改成别的命令：

echo "" >a.txt

[Liteboy]

echo " " > file