Question: Is there any way for me to symlink a particular file so that it appears in every directory on the system?

So if I symlink `/tmp/scratch`

No matter where I am I can type `vi scratch`?

Answer: 
Since Joseph R wanted me to expand, I will. If you use VIM (because that's what I know more than Vi) you can add this to your `~/.vimrc` file.

```
if @% == "scratch"
    silent edit /tmp/scratch
endif

```

Tada, now you have scratch everywhere!
`find / -type d -exec ln -s -T /tmp/scratch scratch {} \;`