"/usr/bin/env" is relying on a binary being present in a specific location just as much as relying on a binary being present in "/bin/bash". For most distros an

"/usr/bin/env" is relying on a binary being present in a specific location just as much as relying on a binary being present in "/bin/bash". For most distros and BSDs, "/usr/bin/env" is more likely to be present, but it's not guaranteed for neither "/bin/bash" nor "/usr/bin/env".