Please don't tell me you use the same IDs and passwords at different customers. That's not at all safe. Does anyone other than yourselves have root (or admin privileges) on these machines? Consider the ramifications. Hacked copy of login, anyone?

To be more direct: sharing passwords across customers could lead to a situation where one customer acquires access to a password belonging to the logins used by your company, giving them access to machines at your other customers, using an ID belong to your company. That would be a bad thing indeed. They might do anything; they could certainly masquerade as the user they got access to; if you use the same passwords internally too, then they could have access to YOUR machines. Consider getting a password manager for the machines at your company and using different passwords for every customer. Shared passwords used this way will sooner or later get you bitten.