On May 25, 2017 9:47:08 AM GMT+02:00, Theo Buehler <t...@math.ethz.ch> 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.
Is a bit unclear if this is what's intended. I wonder if it's rather so that the PPID of a subshell is the same as its parents PPID, such that at any level of subshells, PPID remains the PID of the process spawning the initial shell. /Alexander > >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.
