New comment by leahneukirchen on mblaze repository

https://github.com/leahneukirchen/mblaze/issues/175#issuecomment-629699181

Comment:
`/dev/stdin` is indeed not POSIX, but exist on every system except for AIX it seems. ;)
I can't use `-` as that is the previous message.

`mshow -x . 3` should work fine?