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# Linux/Unix Specific Information

LProf is an open source application that creates ICC profile for cameras, scanners and monitors.

### Measurement Device Setup

#### Serial Port Setup

For serial port measurement devices when you are running as a normal user (IE. not root), you may have to change the permissions on the serial port you are using for your device. You will need to figure out which physical port maps to each logical device (IE. /dev/tty?) so that you can make sure this device has it's permissions correctly setup. As root you can use the following command to make the port accessible:
chmod 666 /dev/ttyS1
but this will only last until the system is rebooted. On non-udev Linux systems a way to make this persistent is to add the chmod command to the /etc/rc.serial file and make sure that rc.serial is invoked in the /etc/rc.sysinit script.
On udev systems systems the creation and accesss rights for devices like serial ports are handled by udev. On many newer systems this will be correctly configured to handle these devices and you will not need to do anything. If however you find that you can not access your device then you will have to modify the udev configuration. You could create a 10-serial.permissions file that looks like this:
ttyS1:root:uucp:0666
and then install it as /etc/udev/<rules.d or permissions.d>/10-serial.permissions, making sure it has owner root, group root, permissions 644. Also the value of <rules.d or permissions.d> depends on your system. So look in /etc/udev to see what this needs to be.

#### USB Port Setup

Some distros are setup with udev rules that correctly handle libusbdevices out of the box and user lucky enough to have one of these systems will not have to do anything to get their devices working. On other systems users will have to modify their hotplug or udev configuration files.

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