我正在编写一个简单的批处理文件，用于根据请求输出jar 所以当我写这个论点时，它必须看起来像this
但是我没有直接写< "input%%~nj.txt" > "output%%~nj.txt"而是想使用变量，所以如果需要的话我可以输出到文件。
我尝试了escaping special characters和set syntax方法 但到目前为止没有运气
这是我的代码段
::per is a variable about setting input or not
::per gets changed to a string after being checked, to be used in java as an arg.
::echo test works so I am sure that there are no errors on that section
IF [%per%]==[1] (set "per= < "input!pth!.txt" > "output%pth%.txt""&echo test)
::testing if per works as intended
::must show per: < "input!pth!.txt" > "output%pth%.txt"
Echo per: %per%
::per shows 1 instead of < "input!pth!.txt" > "output%pth%.txt"
::filename is the name of the jar with .jar
java -Xmx1024M -jar %filename%%per%
那么如何将每variable设置为< "input%%~nj.txt" > "output%%~nj.txt"？