Shell commands really have lasted... I mean if I think of the computer skills that I learned as a teenager that I still use today 1) shell commands 2) sql 3)

Shell commands really have lasted... I mean if I think of the computer skills that I learned as a teenager that I still use today 1) shell commands 2) sql 3) vi 4) some programming languages c, pascal(?), basic(?) Everything else has changed multiple times. Maybe that means its worth investing on learning them.