08-28-2016
I'm afraid expect doesn't work that way. It would execute a command given in the -c option, then execute an expect script (just expect commands) provided either in a file, given by the -f option, or from stdin.
You seem to mix shell and expect commands.
It looks like you want to provide commands via stdin. But, what you do is execute four commands from the shell: expect, expect (again), send, and interact. The latter two will almost certainly be rejected by the shell, with an error message.
Try to put the expect commands into a file, or use "here documents" in the shell
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LEARN ABOUT DEBIAN
viewsu
VIEW-OS(1) General Commands Manual VIEW-OS(1)
NAME
viewsu - change (virtual) user ID or become (virtual) superuser
SYNOPSIS
viewsu [options] [username]
DESCRIPTION
The viewsu command is used to become another user during a login session. Invoked without a username, viewsu defaults to becoming the supe-
ruser. The optional argument - may be used to provide an environment similar to what the user would expect had the user logged in directly.
This command is the View-OS counterpart of the su(1) command. The value of $PATH is reset to /bin:/usr/bin for normal users, or
/sbin:/bin:/usr/sbin:/usr/bin for the superuser. This may be changed with the ENV_PATH and ENV_SUPATH definitions in /etc/login.defs.
OPTIONS
The options which apply to the viewsu command are:
-c, --command COMMAND
Specify a command that will be invoked by the shell using its -c.
-, -l, --login
Provide an environment similar to what the user would expect had the user logged in directly.
When - is used, it must be specified as the last viewsu option. The other forms (-l and --login) do not have this restriction.
-s, --shell SHELL
The shell that will be invoked.
The invoked shell is chosen from (highest priority first):
o The shell specified with --shell.
o The shell indicated in the /etc/passwd entry for the target user.
o /bin/sh if a shell could not be found by any above method.
SEE ALSO
su(1), linux.defs(5)
AUTHORS
View-OS is a project of the Computer Science Department, University of Bologna. Project Leader: Renzo Davoli.
<http://www.sourceforge.net/projects/view-os>
Howto's and further information can be found on the project wiki <wiki.virtualsquare.org>.
NOTE
Most part of the text is taken from su(1).
VIEW-OS: a process with a view August 5, 2009 VIEW-OS(1)