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That was only example. He even can't do "chmod o-r testfile". And, at least on Ubuntu, removing all permissions is allowed, root bypasses checking them. He definitely can't remove read permission from this file and permissions for user, group and others depend on each.
Check if this behavior also concern other files in this directory. And as I suggested earlier check type of filesystem.
Thank you for the generous replies..
At least, knowing that I'm not doing something completely stupid is comforting
There are five mounts, which are hda1, hda2, hda3, hda5, and sda1.
The first two 'hda's have my Windows 7 OS and the type is NTFS, so my DSL (Damn Small Linux) cannot even write to it.
The hda5 and sda1 is FAT. One is FAT32 and one is FAT, in my belief; I'm not at my computer right now, so I don't exactly know. Anyhow, I tried the same commands (and various others which I have not mentioned) and the results are more or less the same... either the files becoming, with some combinations, -r--r--r-- or with others, -rwxrwxrwx.
It's not a particulary important function, since I'm the only one using the computer and the members of my family (who are distrustful, lol) would gasp at a monitor filled with colorful text and no GUI, but nonetheless, it would be better to have them for practice, because I want to know more about Linux!
the very very old fat ( 16 bit for win95 )
or the newer ( 1998) fat32 DO NOT support file permissions
NOR dose the ntfs partition format
there is no way to change them because they DO NOT have any permissions !!