>#!/usr/bin/env $binname vs. hardcoding #!/path/to/binname All of these "solutions" fail somewhere because some system does it differently. Why can't one just

>#!/usr/bin/env $binname vs. hardcoding #!/path/to/binname All of these "solutions" fail somewhere because some system does it differently. Why can't one just use #!bash or #!python and have the system just look on the path for it?