On 04/03/2018 12:29 PM, kalle wrote:

But what do you think of my teaching concept, to try to explain why a
`7' in `755' means =4+2+1=111=rwx="rwx for owner", which is assumed as
self-evident or intuitive in both the original text and your patch?

I think it's out of place in the coreutils manual, just as (for example) the manual need not mention computer keyboard layouts in order to tell users how to type 'sort -r'. Assuming basic computer concepts simplifies the manual and makes it easier for typical users to read, which is a win.

                
where would be a place, to formulate the problem `7=4+2+1'
more generally?

One place would be:

https://en.wikipedia.org/wiki/Octal


Why didn't you take over my correction from "are sometimes special" to
"have a special meaning for directories" ?

I didn't think that was necessary, since the parenthesized cross-reference already mentioned "Directory". The main point here is that the leading "0" is not necessary, not that excess leading "0"s sometimes have special meanings.



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