If we do that, should we revisit the question of ignoring the BOM (Byte
Order Mark) that editors sometimes put at the beginning of scripts?
Does the shebang take advantage of the fact that the first line is
parsed into a bunch of undefined names taken to be a verb? Does that
mean that if username is 'monad', or any noun defined in the user's
profile, that the script will fail?
If so, I think that should be changed. I would like to encourage users
to use 9!:55 to find garbage lines and they can't very well do that if
we depend on them.
Is there a good reason not to ignore the shebang line explicitly, rather
than putting our faith in garbage processing?
Henry Rich
On 3/10/2023 12:04 AM, Elijah Stone wrote:
Perhaps it's simply time to tell the interpreter to start ignoring the
first line of a script if it starts with #!...
On Thu, 9 Mar 2023, Raul Miller wrote:
The recent change in directory naming from j903 to j9.4 introduces an
interesting issue for shell scripts on unix-like systems.
In J shell scripts, this works:
#!/home/username/j903/bin/jconsole
However, this fails with a spelling error:
#!/home/username/j9.4/bin/jconsole
Or, on OSX, the shebang line is different, but the spelling error
remains:
#!/Applications/j9.4/bin/jconsole
That said, there's some other issues here, related to portability. One
of which is that (as a general rule) a home directory is personal
rather than portable. Another is that there's official java jconsole
which does not understand J.
But, also, for a long time now, Debian based distributions have been
distributing j with /usr/bin/ijconsole as a symbolic link to the
current installed location for J. (Here, the 'i' in ijconsole stands
for Iverson.)
So I think that now would be a good time to adopt that as "documented
standard practice" for j shell scripts.
FYI,
--
Raul
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