add a binary to output pdf in terminal directly

```
pdftoppm -png -f 0 -l 1 00a83bbc-0101-f092-4bd7-e75f315e8f14.pdf \
/tmp/00a83bbc-0101-f092-4bd7-e75f315e8f14.pdf
```

Then 

```
imgcat /tmp/00a83bbc-0101-f092-4bd7-e75f315e8f14.pdf-1.png
```