Possible reasons why meld cannot access /dev/fd/* when run as unprivileged user? I suspected meld needed them to be also writable. However, it does say `Could not read file` (notice "read"); plus then the implication would be that they are writable for root, because there was no such error for root. ~$ diff <(echo foo) <(echo bar) 1c1 < foo --- > bar ~$ meld <(echo foo) <(echo bar) # not working, see comment below ~$ sudo -s ~# meld <(echo foo) <(echo bar) # works just fine The first one returns `Could not read file` and `[Errno 2] No such file or directory: '/dev/fd/63'`. What do you suspect is the reason for this behavior? ![Screenshot]( Unprivileged user above, root below. ![Screenshot, root](

This happens when a Meld window is already open. In that case, running `meld` again tries to use the existing Meld process; but that process can’t access the `/dev/fd` files which are used for the substitution...

There doesn’t seem to be an option to force Meld to use the “new” process, ignoring all others.