Monday, September 25, 2006

Redhat Enterprise Linux System File Permission

Redhat Enterprise Linux device file permission could not be changed simply by using the chmod command. Instead, the device file permission is set by udev hotplug subsystem which is included in almost every 2.6 kernel based Linux distribution that is shipping.

The configuration file /etc/udev/permissions.d/50-udev.permissions defines the permission of each devices present in the Linux system. For example,

  • To change the raw devices file permission, search for the line that read as raw/*:root:disk:0660
  • To change tape drive file permission, search for the line that read as st*:root:disk:0660
The default permission defined is 0660. Simply change the 4 digits code as usual to an expected permission, say 0666 instead of 0660.

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