Rainer, using sudo does not makes you a root user. To become a root user you have to switch with "su -" (and login with root password).
Sudo has its own configuration file. If you can do something with sudo on other systems means there is a different configuration for sudo. Check "man sudo" Cheers, Peter Am Mittwoch, 9. März 2022, 19:28:49 CET schrieb Dr Rainer Woitok: > Greetings, > > until recently my system behaves sort of strangely: > > $ touch /tmp/file > $ ls -l /tmp/file > -rw------- 1 rainer rainer 0 2022-03-09 19:06 /tmp/file > $ echo x | sudo tee /tmp/file > Password: > tee: /tmp/file: Permission denied > x > $ chmod a+w /tmp/file > $ ls -l /tmp/file > -rw--w--w- 1 rainer rainer 0 2022-03-09 19:06 /tmp/file > $ echo x | sudo tee /tmp/file > tee: /tmp/file: Permission denied > x > $ > > Since when can't root write to files it doesn't own? And not even, if > the file has write permission for everybody? > > This worked as long as I can think of. My last routine upgrade install- > ed new kernel package "sys-kernel/gentoo-sources-5.15.26", so I built > the new kernel and booted from it. May this be the reason? > > When I'll have time to reboot, I'll test the above commands on my old > kernel, 5.15.19. But perhaps there's another reason? > > Slightly puzzled > Rainer
