I don't know why it isn't working.

I would not embed passwords in a script - particularly root passwords. Therefore I wouldn't try to solve the problem you are experiencing.

I would use public key authentication to enable automated access on a remote system, particularly in the case of root access. I might also use sudo to enable select commands for non-root users, rather than su to root.

In reply to Re: Change user to root using ssh::expect by ig
in thread Change user to root using ssh::expect by want2bemonk

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