One of the humorists I worked with at Bell Labs in the 1980s would always report error code 13 as the error when no more specific error code was available. Whe

One of the humorists I worked with at Bell Labs in the 1980s would always report error code 13 as the error when no more specific error code was available. When one looked that up in the man page, it just said "you are unlucky".