append usingtext的using指令是什么

来源：蜘蛛抓取(WebSpider) 时间：2016-06-04 14:43 标签： append using
Android中 setText()和append()方法区别在哪里？_百度知道Categories
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By Gerardo Lopez, on August 23rd, 2009
Here’s a quick tutorial on how to add text to the end of a text file using the Add-Content or its alias ac in PowerShell. In this first example let’s add &This is the last line& to the end of a file.
Add-Content c:\sample.txt &This is the last line&
The example above adds the text to the last line, it doesn’t actually create a new line, so let’s try it again, and make sure that this time the text that we concatenate is on the last line all by itself.
Add-Content c:\sample.txt &`r`nThis is the last line&
You’ll notice a `r`n this is an escape character to tell PowerShell to add a carriage return and a new line, you’ll need this when working with Windows file.
If your going to move this file to a unix or linux computer, you’ll only need a `n there’s no need for the carriage return.
Here is a list of escape characters:
— Null
— Alert
`b — Backspace
`n — New line
`r — Carriage return
`t — Horizontal tab
`’ — Single quote
`” — Double quote
The example I gave above was the quick and dirty, we should really explicitly state our arguments and use quotes around the path, to do that we will add a path and a value argument
Add-Content -Path &c:\sample.txt& -Value &`r`nThis is the last line&
Here’s a useful example, suppose you want to map hostname to a particular IP address.
Let’s
to point to 127.0.0.1, we’ll do this using the ac alias for Add-Content.
ac -Path &C:\WINDOWS\system32\drivers\etc\hosts& -Value &`r`n127.0.0.1
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