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From: guy%gorodish@Sun.COM (Guy Harris)
Newsgroups: comp.sys.att
Subject: Re: a few questions on the 3B1
Message-ID: <31868@sun.uucp>
Date: Fri, 23-Oct-87 17:34:15 EST
Article-I.D.: sun.31868
Posted: Fri Oct 23 17:34:15 1987
Date-Received: Sun, 25-Oct-87 18:36:29 EST
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> Well, there is a shell parameter called IFS (internal field separator) which
> delimits tokens to sh.  If you change IFS to also include 'p' (as well as
> space, tab and newline), the 'export' line becomes 'ex ort'.  Presto, you
> are in the editor, from which you can do a shell escape.

The fix to this particular trick is to set IFS as the first thing your script
does (no, an assignment that sets IFS doesn't depend on the setting of IFS; I
didn't believe it until I tried it); while you're at it, make sure you set PATH
right afterwards.

For those of you not sure how you *can* set IFS as part of logging in, note
that "login" in S5 takes a list of environment variable settings as optional
arguments, and that "getty" will pass arguments of that sort to "login"; the
only ones the manual page claims "login" *won't* change are PATH and SHELL.
	Guy Harris
	{ihnp4, decvax, seismo, decwrl, ...}!sun!guy
	guy@sun.com