dxuranus schrieb: >i login with nuroot user id and want to run a process(like listen port >under 1024) which only root priority allowed,what can i do(set_uid >can't >do this). >thanks for any help! > Is this a daemon process which shall run every time you boot? Then write a chkconfig compatible init script to be placed inside /etc/init.d/. If you just want to test something you might run su - nohup <process> exit Alexander