Hello, I saw that the permission of screen is -rwsr-xr-x, which means when screen is run, it's run as root at the beginning. I don't know if it can be a security issue. I also checked the screen program in Debian. It uses setguid as a non-root group. -rwxr-sr-x 1 root utmp ... /usr/bin/screen Iru -- Please do not send me Microsoft Office/Apple iWork documents. Send OpenDocument instead! http://fsf.org/campaigns/opendocument/