How to use `expect` tool to switch users?

Solution Verified - Updated -

Issue

  • How to use expect tool to switch users?
  • How can one execute su with password in plain text on the same command line? Is there any way to achieve this using some script?
  • When one executes su - root in terminal, it will show like this:
[user@localhost ~]$ su - root
Password: 
[root@localhost ~]#
  • It's required to have some tool/script to work as follows.
[user@localhost ~]$ su - root <someoption> password
[root@localhost ~]#

or

[user@localhost ~]$ su - root | cmd password
[root@localhost ~]#

Environment

  • Red Hat Enterprise Linux 7
  • Red Hat Enterprise Linux 6.5

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