Date Math:

50 days after today & 1 day before today

date -v +50d 
date -v -1d 

Info of a georeferenced raster (i.e. tiff format) file

gdalinfo filename.tif

Weather forecast from terminal. Change city (berlin) for other locations.

finger berlin@graph.no

Result:

Send an attachment using mutt via terminal

echo "body" | mutt -a "Path/to/thefile.ext" -s subject text -- user@email.com