LinuxQuestions.org - how to assign oneself to a group to get access to a file

I'm on a regular Fedora 9 desktop computer with an ext3fs filesystem.

I'm trying to give myself access to /dev/ttyS0. This is because I'm developing code that uses a serial port. While I'm developing this code I don't want to be continually working as super user. I have the following information about /dev/ttyS0:

Code:

[freddy@localhost ~]$ ls -lh /dev/ttyS0 

crw-rw---- 1 root uucp 4, 64 2009-09-04 12:27 /dev/ttyS0

So as root I added myself (username freddy) to the group uucp. This is just temporary, for while I work on this code and try different stuff as user freddy. Once the code is established and I have a single program with a fixed name, I plan to give myself an entry in /etc/sudoers that will allow me to run the finished program. Here's the info on user freddy:

Code:

[freddy@localhost ~]$ id freddy

uid=500(freddy) gid=500(freddy) groups=500(freddy),14(uucp) context=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023

[freddy@localhost ~]$ groups freddy

freddy uucp

The problem then is that now if I try to use /dev/ttyS0 I can't.

Code:

[freddy@localhost ~]$ echo "hello" > /dev/ttyS0

bash: /dev/ttyS0: Permission denied

[freddy@localhost ~]$ cat /dev/ttyS0

cat: /dev/ttyS0: Permission denied

I thought that if I was a member of group uucp which is associated with /dev/ttyS0 that I would be given rw access to /dev/ttyS0. What am I missing here?

Also, does anyone know what the c stands for in the ls -l listing?