On Thu, Oct 8, 2020 at 12:01 PM Patrick O'Callaghan <[email protected]> wrote: > On Thu, 2020-10-08 at 08:14 +1100, Cameron Simpson wrote: >> On 07Oct2020 11:07, Patrick O'Callaghan <[email protected]> >> 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. Using #!/usr/bin/env bash" supplies "#!" with an absolute path and runs the script using the first instance of "bash" in $PATH. _______________________________________________ users mailing list -- [email protected] To unsubscribe send an email to [email protected] 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/[email protected]
