i'm trying to clarify the numerous ways to invoke bash --
login vs non-login shell, interactive vs non-interactive --
the implications this has for startup files and so on.
first, is there any more comprehensible explanation
than the man page? i mean, the man page is all right,
but it sure is terse.
and second, AFAICT, there are two ways to see the
invocation method that i know of
1) running "ps -f" -- if the shell name is prefixed with
a "-", then this was a login shell
2) display the invocation options with "echo $-". if there's
an "i" in there somewhere, it's an interactive shell
(based on the docs, it seems that checking whether or not
PS1 is set is also a way to see if it's interactive)
i've noticed that, for a real, virtual console login shell,
the results i get are
shell name: -bash (login shell)
options: himBH (interactive)
which brings up another question: since the initial login
shell is invoked by the login program, how does the login
program know which options to use for that initial shell?
is there a customization file somewhere that tells "login"
how to start a login, interactive bash shell? nothing in the
login man page suggests this.
rday
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