فایل bat و تغییر متغیرها

i want change a variable in a bat file

after run bat file ask me a username then insert that username in a Textline and Run it

example : after run bat file ask user name . for sample i insert abcdef555

then insert abcdef555 to this text and replace with wwwww on end of text file and run it

before :

xmrig.exe -o xmr.2miners.com:2222 -u 44eEFY2Jx5R4yqNuffejZXQXbGgw1QjhwcwCiXYdh4aBhyc9ofYgzan442bPXRF6EgEydzMmrYJg3bJh7XEHMtnuPdqJbxm.wwwww -p x

after :

xmrig.exe -o xmr.2miners.com:2222 -u 44eEFY2Jx5R4yqNuffejZXQXbGgw1QjhwcwCiXYdh4aBhyc9ofYgzan442bPXRF6EgEydzMmrYJg3bJh7XEHMtnuPdqJbxm.abcdef555 -p x