tenses - Proper way to write a acronym that's become a verb

In the Unix programming world there's a command called cd. It stands for Change Directory.

From what I can research it's at least 35 years old.

I often hear at my job "Then we'll cd into ".

With that usage established I was wondering if there's an established standard for how to specify a past tense use for this term.

I've tried using Target directory couldn't be cd'd but I'm unsure how that sounds to a general audience.