windows alias

1. Make file cmd-alias.bat in the user path C:\Users\Dell with content like below. You also can make this file in other path.
doskey sayhello=echo Hello $*
doskey cattxt=type xxxxxxxxxxxx.txt $*

2. Win+R > regedit>HKEY_LOCAL_MACHINE\Software\Microsoft\Command Processor make a new key AutoRunwith value C:\Users\Dell\cmd-alias.bat then save and exit.
3. here you may need to reboot your computer.

Then you can run the command sayhello in cmd.