cmd escape character ^

cmd escape character ^

cmd转义字符

A caret (^) character in a command line means that the character immediately following it is interpreted literally 

^字符可以用来在命令行中用来转义，一个例子

to set the output of var into a variable without creating a temp file, go a bit more complex with:

for /f "delims=" %a in ('ver ^| findstr /v "linux"') do @set myvar=%a

check it with:

echo %myvar%

上面的例子中， ver ^| 转义了|，告诉cmd这个命令ver ^| findstr /v "linux" 是一个完整的命令， 这样shell就不会将for /f "delims=" %a in ('ver ^认为是一个将标准输出重定向到findstr /v "linux"') do @set myvar=%a标准输入的命令了。 

find more on the caret command 

更多的关于^的内容， 请看 Batch: Escaping with caret 和How to avoid cmd.exe interpreting shell special characters like <> ^.

References

Command Window 

Batch: Escaping with caret

How to avoid cmd.exe interpreting shell special characters like <> ^