[sr #111102] ksh93 oddity w.r.t. ${1+"$@"} on AIX (for section "Portable Shell"?)

URL:
  <https://savannah.gnu.org/support/?111102>

                 Summary: ksh93 oddity w.r.t. ${1+"$@"} on AIX (for section
"Portable Shell"?)
                   Group: Autoconf
               Submitter: None
               Submitted: Fri 02 Aug 2024 03:16:59 PM UTC
                Priority: 5 - Unprioritized
                Severity: 3 - Normal
                  Status: None
                 Privacy: Public
             Assigned to: None
        Originator Email: [email protected]
             Open/Closed: Open
         Discussion Lock: Any
        Operating System: None


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Follow-up Comments:


-------------------------------------------------------
Date: Fri 02 Aug 2024 03:16:59 PM UTC By: Anonymous
I know you already recommend not to use ${1+"$@"} in section "Portable Shell"
-> "Shell Substitutions" of the info manual.

Here might be another reason why: Certain ksh version on AIX drop trailing
empty arguments when expanding ${1+"$@"}.  Like this:


$ uname -a
AIX host 2 7 00F7BD2A4C00
$ echo ${.sh.version}
Version M 93t+ 2009-05-01
$ set x foo bar baz ""
$ shift 1
$ echo $#
4
$ set x ${1+"$@"}
$ shift 1
$ echo $#
3
$ echo ":$1:$2:$3:"  
:foo:bar:baz:


When using regular "$@" things work as expected:


$ set x foo bar baz ""
$ shift 1
$ echo $#
4
$ set x "$@"
$ shift 1
$ echo $#
4


Probably worth mentioning in the info manual?

Thanks!








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