On Sat, Feb 25, 2017 at 09:08:55AM -0800, Steven Penny wrote: > On Sat, 25 Feb 2017 11:46:08, cyg Simple wrote: > > If *your* script has a dependency to run using *dash* instead of *sh* > > then you _must_ use #!/bin/dash anyway. > > I think you have a fundamental misunderstanding of what Dash is. Dash is a > minimal shell, similar to the "sh" defined by POSIX: > > http://pubs.opengroup.org/onlinepubs/9699919799/utilities/sh.html > > So saying "a dependency to run using *dash*" makes about as much sense as > saying > "Cygwin has a dependency to run using Cygwin". > > > And what I _*I*_ don't want dash as /bin/sh? You see not everyone in the > > community will agree. > > With respect to the community, yes of course you get a say. If the community > doesn???t agree on this we will continue to use Bash. However you do not get > a say > with respect to the standard. The POSIX standard specified that /bin/sh is the > shell I have linked above. Bash is a superset of that, so by definition those > extra features are not defined or guaranteed to exist. When writing /bin/sh > scripts, you should be assuming the users /bin/sh only has those features > defined by POSIX. Example: > > #!/bin/bash -> script that follows might have Bashisms > #!/bin/dash -> script that follows might have Dashisms (echo -n, local) > #!/bin/sh -> script that follows should be a POSIX script > > > You can make the suggestion to those using your script to do so otherwise > > but > > forcing dash as /bin/sh worldwide isn't something you can actually do. > > Yes we certainly can. Debian and Ubuntu have already done this. > "we" being you and who else?
/bin/sh has been bash for a long time and I would prefer it stays that way. OTOH, I have started prefacing scripts with /bin/bash -p to be on the safe side. "-p" stops bash from importing functions from the environment BTW Cheers ... Duncan. -- Problem reports: http://cygwin.com/problems.html FAQ: http://cygwin.com/faq/ Documentation: http://cygwin.com/docs.html Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple
