Change hardcoded -broken- bash path for *nixes
Change hardcoded -broken- bash path for *nixes

For portability /usr/bin/bash should not be used: it does not exist on
most *nixes (instead it is /bin/bash on most Linuxes). /usr/bin/env bash
can be run on most *nixes including BSD families and Linuxes.

See: https://stackoverflow.com/a/10383546/73673

CanalTP/mimirsbrunn,CanalTP/mimirsbrunn