On Thu, May 25, 2017 at 09:47:08AM +0200, Theo Buehler wrote:
> On Thu, May 25, 2017 at 09:03:43AM +0200, Otto Moerbeek wrote:
> > On Wed, May 24, 2017 at 04:27:06PM -0400, Choose a display name wrote:
> >
> > > I don't quite understand the description of the PPID in the sh manual.
> > >
> > > >PPID The shell's parent process ID. Subshells have the same
> > > > PPID as the parent of the current shell.
> > >
> > > PPID is the shell's parent's pid, okay (by the way, shouldn't the
> > > second "'s" be added?). But, according to the next sentence, subshells
> > > have the same value in their PPIDs as the current shell's parent have
> > > in its PPID. Is it correct?
> >
> > Yes,
> > http://pubs.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html#tag_18
>
> I think the point is that the current phrasing in sh(1) is incorrect.
> POSIX says this:
>
> In a subshell [...], PPID shall be set to the same value as that
> of the parent of the current shell.
>
> and sh(1) says this:
>
> Subshells have the same PPID as the parent of the current shell.
>
> I think either we should say something more explicit like
>
> The PPID in a subshell is the PID of the parent of the current
> shell.
>
> or we drop "the parent of":
>
> Index: sh.1
> ===================================================================
> RCS file: /var/cvs/src/bin/ksh/sh.1,v
> retrieving revision 1.141
> diff -u -p -r1.141 sh.1
> --- sh.1 16 Mar 2017 20:06:37 -0000 1.141
> +++ sh.1 25 May 2017 07:31:53 -0000
> @@ -2091,7 +2091,7 @@ Enable POSIX mode
> The shell's parent process ID.
> Subshells have the same
> .Ev PPID
> -as the parent of the current shell.
> +as the current shell.
> .It Ev PS1
> User prompt displayed every time an interactive shell
> is ready to read a command.
Yes, reading it again this is correct,
-Otto
