How can I define a bash alias as a sequence of multiple commands? [duplicate]

For chaining a sequence of commands, try this:

alias x='command1;command2;command3;'

Or you can do this:

alias x='command1 && command2 && command3'

The && makes it only execute subsequent commands if the previous returns successful.

Also for entering passwords interactively, or interfacing with other programs like that, check out expect. (http://expect.nist.gov/)