On Thu, 2020-10-08 at 21:59 +0200, Tom H wrote: > On Thu, Oct 8, 2020 at 12:01 PM Patrick O'Callaghan > <pocallag...@gmail.com> wrote: > > On Thu, 2020-10-08 at 08:14 +1100, Cameron Simpson wrote: > > > On 07Oct2020 11:07, Patrick O'Callaghan <pocallag...@gmail.com> > > > wrote: > > > > On Tue, 2020-10-06 at 15:45 -0700, ToddAndMargo via users wrote: > > > > > I start all my Raku programs with > > > > > 1: #!/usr/bin/env raku > > > > > > > > Why? If you aren't adding options to 'env', surely this is the same > > > > as using '/usr/bin/bash'. > > > > > > No, this is a standard shebang (#!) hack to accomodate differering > > > installation paths. The #! requires a fixed absolute path. So things > > > which are often installed in different places (such as raku above) > > > like /usr/local/bin or /opt/something and accessed via the user's > > > $PATH setting, putting in this line makes the script more portable. > > > > The user's export environment, including the PATH setting, is > > automatically included, even if you have no shebang at all: > > > > $ cat test > > type python3 > > echo $PATH > > $ chmod+x test > > $ ./test > > python3 is /usr/bin/python3 > > /usr/lib64/qt-3.3/bin:/usr/share/Modules/bin:/usr/local/bin:/usr/bin:/bin:/usr/local/sbin:/usr/sbin:/home/poc/.local/bin:/home/poc/bin > > You missed "#! requires a fixed absolute path", so you can't use > "#!bash" even though $PATH is set.
Yes, I know. > Using #!/usr/bin/env bash" supplies "#!" with an absolute path and > runs the script using the first instance of "bash" in $PATH. OK, I can see the point of that, thanks. I realise that Cameron was saying the same thing and I hadn't absorbed it. poc _______________________________________________ users mailing list -- users@lists.fedoraproject.org To unsubscribe send an email to users-le...@lists.fedoraproject.org Fedora Code of Conduct: https://docs.fedoraproject.org/en-US/project/code-of-conduct/ List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines List Archives: https://lists.fedoraproject.org/archives/list/users@lists.fedoraproject.org
