Re: interactive shell detection in shrc

[Robert Elz <kre%munnari.OZ.AU@localhost>]

    Date:        Thu, 26 Sep 2024 15:16:39 -0700
    From:        "Greg A. Woods" <woods%planix.ca@localhost>
    Message-ID:  <m1stwmt-0036s2C@more.local>

  | I'm very curious:  why did you include "m" in that test?

I wondered about that as well.   But I suspect you have
supplied the answer.

  | I do note the following from the bosh(1) manual:
  |
  | 	... POSIX requires that job control is auto-enabled for
  | 	interactive shells ...

It actually requires it to be on by default in interactive shells,
that's almost what the above says, but it could be read as not
allowing "sh +m" to start an interactive shell with job control
disabled -- which is not what posix requires.

  | But I'm pretty sure the key word there is "interactive", which will by
  | definition also mean they have 'i' in $-.

It would, but as you point out -i isn't always available there, but -m
should be, so unless someone actually did run "sh +m" checking for -m
is I guess a way to guestimate that the shell is interactive (-m is,
in practice, almost never turned on or off on the command line, it
just defaults on in interactive shells, and off in others).

kre