Yes and no. Special files are kernel facilities. The shell recognizes "|" as a pipe request, creates the special file and file descriptors. The communication between the processes does not involve the shell.
-- Shmuel (Seymour J.) Metz http://mason.gmu.edu/~smetz3 ________________________________________ From: IBM Mainframe Discussion List [IBM-MAIN@LISTSERV.UA.EDU] on behalf of Paul Gilmartin [0000000433f07816-dmarc-requ...@listserv.ua.edu] Sent: Wednesday, April 13, 2022 9:14 PM To: IBM-MAIN@LISTSERV.UA.EDU Subject: Re: View ASCII Command inUSS On Thu, 14 Apr 2022 08:46:50 +0800, David Crayford wrote: >>> >> Can the behavior be replicated with /bin/sh? > >Worth a try. > Indeed. If the same bug exists in both shells Rocket is likely to fix it sooner than IBM. >The fact that it's using pipe operators implies the shell is in play. > I *believe* pipe is a kernel facility which shell invokes with C RTL calls (pipe(); fork(); exec(); dup2; ... ). Shell doesn't actually move the data. But there's plenty wiggle room in the options shell supplies to those C RTL calls: it might be able to enable/disable autoconversion or tag the descriptors with CCSIDs (incorrectly?) An IBM expert averred long ago on MVS-OE that the actual conversion is performed by kernel. >As I said, I would take this to Rockets forum which is a more appropriate >place to discuss bash. > >> But does bash supply unsolicited arguments to utilities? >> >> Appendix L describes too many knobs and levers. >> On Tue, 12 Apr 2022 13:00:30 -0500, Michael Babcock wrote: >> >>> I had to add the -B to prevent “head” from doing autoconvert on the file. >>> >>> -bash-4.3# iconv -f ISO8859-1 -t IBM-1047 trace_large.log | head -B >>> ******************************************************************************** -- gil ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
