On Thu, 26 Oct 2023 19:24:31 -0500 Bill Barry <[email protected]> dijo:
>On Thu, Oct 26, 2023 at 7:21 PM Bill Barry <[email protected]> wrote: > >> >> You want them read only, 600 is read/write. Read by world would be >> good might work better >> chmod -R 004 * >Or better chmod -R 0444 * I tried man chmod, but it had zero about the numbers, although it had a link to a web page that was supposed to give examples of usage, but it turned out to be just a site proclaiming the virtues of gnu. I did learn that the numbers are called 'octal numbers' and stand for who can read, write an execute the file. There is evidently a system for how to assemble the octal number, but it remains a mystery to me. After applying 600 to all the files in a folder I did 'ls -la' and every file had -rw-------. I take it that means that I can read or write the file, but everyone else gets a dash, so they have to suck eggs. However I gave the command with sudo, so I don't know if the 'rw' applies to me or to some computer god. They're all .mp3 files, and if I double-click on one in the file manager it plays, so no worries. After applying the 600 I got a popup on my screen 'Writing data to the drive -- do not unplug.' Right now the popup has remained there for a couple hours, so my guess is that it's a lie. I'm just going to umount it and put it in the phone. Edit: I'm afraid I lost this play. I had to reinsert the SD card six times before it finally connected, and when the phone came up it said: Unsupported SD card This device doesn't support this SD There was no problem before when it was exFAT. Of course, exFAT can't do permissions, so Android is free to delete anything on the card. FAT32 won't help either, but I wonder if Android can read NTFS.
