I have two huge files (150G each) and I need to use a tool for which I should supply them as a single file (since the tool only accepts one file). However, I do not want to merge these files for several reasons, but I cannot pipe them using something like <(cat file1 file2) or myfile=$(cat file1 file2) because the script uses the path of the input file, not its content.

So I would need something like the following:

alias myfile = "cat file1 file2"

So that using the following command would work:

tool_x --file /path/myfile 

I already tried this mentioned command, but it didn't work.

I would just need to be able to treat the result of a "cat" command as an actual file, with the possibility to accessing this file using a path.

Is it possible to achieve something like that?