The whole point of "#!" working in shell is that the two-bytes
(a) mark the file as executable by a specific shell command and
(b) are a shell comment.
One fairly simple fix that would make annotating here scripts
and the like simpler for shell(ish) execution would be simply
ignoring all text from "\n#" to the first "\n", which would
allow the #! to function as a comment -- just as it does in
the shell.
Another way to do it would be adding a '#' command to psql,
similar to '\', that accepts a one-line directive and ignores
it entirely. This would use the existing framework for detecting
the context of '\' as a command, just with a different magic
char.
--
Steven Lembark 1505 National Ave
Workhorse Computing Rockford, IL 61103
lembark@wrkhors.com +1 888 359 3508