User talk:Guy Harris/Archives/2022/06

file-system permissions
"...the software that used it did not support multiple users, so it wasn't a permission flag that applied to particular users."

You are correct, the concept of a USER with an identity did not exist on early systems. There is an idea of multiple/ non-simultaneous users ( you in the morning and me in the afternoon). The ro flag did not permit any users to modify the file, unless they reset ro.

Recent implementations of FATxx file systems (partially) implement read only presenting it in POSIX rwxrwxrwx an example is Raspberry pi /boot volume.

dapi2:/boot > ls -l x.xxxx -rwxr-xr-x 1 root root 0 Apr 26 07:51 x.xxxx* dapi2:/boot > sudo chmod a-w x.xxxx [sudo] password for dgerman: dapi2:/boot > ls -l x.xxxx -r-xr-xr-x 1 root root 0 Apr 26 07:51 x.xxxx* dapi2:/boot > sudo cat >>x.xxxx -bash: x.xxxx: Permission denied

FYI as I was gathering this information I inserted an Rpi SD card into a new 14" MacBook Pro running Monterey 12.4 and it promptly crashed hard!

PS We seem to cross paths occasionally, I'd be interested to know about you background.

DGerman (talk) 23:08, 6 June 2022 (UTC)

Good work on 5nm!
Hi, saw your recent edits on the 5nm article (I take care of the page as well, along with 3nm, 2nm and a few more). Very good work, keep it up! 188.66.33.101 (talk) 08:16, 14 June 2022 (UTC)