Could any one help me with grep : I'm new to shell script and i am assigned to grab files that only contains ascii text.
I found this code online but just dont get it. 
```
grep '[^ -~]'  $someargument
```
could anyone help me with it? Thanks!

I found this has the same functionality as 
```
grep -P -L -r '[^[:ascii:]]' $someargument



