On Sat, 2011-07-23 at 17:53 -0400, David A. De Graaf wrote:
> As I understand it (from the golden years of UNIX), what happens when
> I type /bin/su - dad is roughly this:
> - the shell forks, creating a child with all of the parent's exported
> environment but not the rest, and including stdin, stdout, and
> stderr.
RTFM. According to the info page on su:
`-'
`-l'
`--login'
Make the shell a login shell. This means the following. Unset all
environment variables except `TERM', `HOME', and `SHELL' (which
are set as described above), and `USER' and `LOGNAME' (which are
set, even for the super-user, as described above), and set `PATH'
to a compiled-in default value. Change to USER's home directory.
Prepend `-' to the shell's name, intended to make it read its
login startup file(s). When this option is given, /etc/pam.d/su-l
PAM file is used instead of the default one.
IOW the DISPLAY environment variable will not be passed to the child
shell in this case.
poc
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