This question already has an answer here:

Lets say that I put alias unalias='echo bob' in my bash.rc file, how could I without an editor unalias unailias.

marked as duplicate by Jeff Schaller, Stephen Harris, tink, Sparhawk, elbarna Feb 15 at 6:21

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

Browse other questions tagged or ask your own question.