Hello, I have a RedHat 9 Linux. when I run "ps -aux " see many threads in square brackets, like [kthread] [kacpid] [kblockd/0] [pdflush] There are of course some processes without square brackets like syslogd,portmap, and more. My question is : what is the meaning of the square brackets? is that specify that the thread is a kernel thread ? Regards, John -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/