Are there any? Like, customer relations management. The AND of the people who use CRMs and people who mainly use command line utilities is small, but it has to exist.
That honestly sounds horrible. Your average CRM probably has a relatively complex data schema. Can you imagine expressing things that a CRM does in a single command line statement? Maybe a REPL would be realistic, but when you say command line do you mean a REPL or something like "crm --create-customer $name"
I wasn't able to find any with a few searches. Your best bet might be something which wraps up the Salesforce.com REST APIs within a REPL-type environment. I believe there are generic interactive tools for working with REST APIs which would be a good base to start from.
I doubt you will find any. The intersection between command line users and CRM users must be extremely small. Maybe you can find one that has a GUI plus command line support.
Build a command line interface using an existing CRMs API.