Users and Groups

[Karl Larsen]

Michael A Peters wrote:
>> Why did someone invent "usermod"? And when you do a ls -l on /dev/ttyS0, 
>> the first serial port you notice:
>>
>> [root at k5di ~]# ls -al /dev/ttyS0
>> crw-rw---- 1 root uucp 4, 64 2007-12-07 04:52 /dev/ttyS0
>> [root at k5di ~]#
>>
>> The only way I can ever use Com1 is to be root or belong to the uucp Group.
>>     
>
> Did you ask how to do that?
> I have a file called
>
> /etc/security/console.perms.d/51-custom.perms
>
> It contains the following:
> # device classes -- these are shell-style globs
> <garmin>=/dev/ttyS0
>
> # permission definitions
> <console> 0600 <garmin> 0660 root.uucp
>
>
>
> I wrote the file because I have a garmin gps that uses the serial
> port, /dev/ttyS0
>
> With that file in place, I do not need to do something dangerous like
> add my user to the uucp group.
>
> I wish there was a gui tool to set that kind of thing up, though to be
> honest, there are very few device nodes for which you ever need to set
> that kind of thing up.
>
>
>
>
>
>   
    Sorry. I am a stupid PHd. But if those able to use /dev/ttyS0 are 
root and uucp how do any others use it?

Karl


-- 

	Karl F. Larsen, AKA K5DI
	Linux User
	#450462   http://counter.li.org.