On 20 July 2017 at 18:44, Joe Zeff <j...@zeff.us> wrote: > On 07/20/2017 02:30 PM, George N. White III wrote: > >> On 20 July 2017 at 17:41, Joe Zeff <j...@zeff.us <mailto:j...@zeff.us>> >> wrote: >> >> On 07/20/2017 05:31 AM, George N. White III wrote: >> >> >> Rigid adherence to a standard is often overkill. Bashisms have >> been a >> practical problem for systems that use dash for /bin/sh. >> >> >> My understanding is that when bash is invoked as sh, it acts exactly >> as sh itself would, so that only those builtin commands that are in >> sh are available. Judging by what you write, this seems not to be >> the case any more. >> >> >> I don't recall the details, but problem scripts may well have had "#! >> /bin/bash" before the decision >> to use dash. >> >> > If so, the scripts should have been run using bash, not dash. In any > event, if bash is specified, /bin/sh shouldn't ever be invoked.
A policy change required system scripts to use dash. The change was made to reduce startup time and exposure to bugs in bash. The problems came because it was not simply a matter of changing :bash" to "dash" -- some scripts needed to have bashisms removed. -- George N. White III <aa...@chebucto.ns.ca> Head of St. Margarets Bay, Nova Scotia
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