So if I want to change that to the whole file, I "just" have to Ctrl+A Meta+F Meta+F Meta+D Ctrl+D Ctrl+D RET. That's not really an improvement – especially since it depends on how many dots or similar are in the filename.
Also, that's a Useless Use of head, since grep has the option "-m10"
Also, that's a Useless Use of head, since grep has the option "-m10"