I give up trying to quote appropriate context. Here's what bash 5.0 is doing:
unicorn:~$ echo "$PATH" /home/greg/bin:/usr/local/bin:/usr/bin:/bin:/usr/local/games:/usr/games:/sbin:/usr/sbin unicorn:~$ type moo bash: type: moo: not found unicorn:~$ echo "echo Moooo" > ./bin/moo unicorn:~$ moo bash: /home/greg/bin/moo: Permission denied unicorn:~$ type moo moo is hashed (/home/greg/bin/moo) Whether that's correct behavior or not, I can't even guess. As far as the historical usage of ":" vs. "#!", I would trust Sven Mascheck's page over all other sources. https://www.in-ulm.de/~mascheck/various/shebang/ It links to an old "Unix FAQ" that explains the history of the ":" thing, but Sven's page disputes some of the FAQ's explanation. You'll need to read both pages to get the full picture.
