"add to favorite commands" command

Imagine: I am testing something (let's say traveller possible exploit) , i really need fast command, i use /fastcom [world/local] [add/edit/delete] mycommand data entity Travelling_merchant {Data i want to change} 

fastcom : "fast command" command

[world/local]: wether the command is saved in the world file or in txt file in .Minecraft

[add/edit/delete] : you get it

mycommand : my command name

i did a little of java and i'm pretty sure it's no problem to go to a txt file and ask for a line and copy it