Re: interactive shell detection in shrc

[Steffen Nurpmeso <steffen%sdaoden.eu@localhost>]

Greg A. Woods wrote in
 <m1suHsv-0036s2C@more.local>:
 |At Fri, 27 Sep 2024 07:14:46 +0700, Robert Elz <kre%munnari.OZ.AU@localhost> wrote:
 |Subject: Re: interactive shell detection in shrc
 ...
 |Reading POSIX Issue 7 sh(1) just now I note the following text:
 |
 | If the -i option is present, or if there are no operands and the
 | shell's standard input and standard error are attached to a
 | terminal, the shell is considered to be interactive.
 |
 |So there's nothing in POSIX about login(1) tacking a leading hyphen on
 |and using that to trigger the shell to become a login shell.
 |
 |Indeed from what I can tell POSIX has nothing whatsoever to say about
 |"login shells" nor /etc/profile or $HOME/.profile.
 |
 |I guess to be entirely POSIX compatible my test should include:
 |
 | tty >/dev/null 2>&1 && tty <&1 >/dev/null 2>&1 &&
 |  [ "$0" = "$SHELL" ] &&
 |  _interactive=true


then you have to go Simon J. Gerraty who ensured me that he always
uses -t and i found out then this indeed is very old and usable.
-t 0 && -t 2, thus.
(I think Robert fixed the NetBSD shell to also go 0 and 2 lately.)

(And, dear Robert, i am not looking at the other emails as i am
afraid you have given an answer (and it surely says something like
that the space is a separator put by echo); i had a thinking
coming into my brain when i was doing the dishwash, last night.)

--steffen
|
|Der Kragenbaer,                The moon bear,
|der holt sich munter           he cheerfully and one by one
|einen nach dem anderen runter  wa.ks himself off
|(By Robert Gernhardt)