about pipes

Hello,

I need your help, but I'm not a shell guru and i need hours for some
lines...So keep cool and speak slowly!

I have to wait text lines from /dev/ttyS0 and to store them in files.

# cat /dev/ttyS0 >> /home/christophe/alarme/$(date +%Y_%m)

Does what i want.

So i write a small script
#! /bin/sh
echo "emulation imprimante"
cat /dev/ttyS0 >> /home/christophe/alarme/$(date +%Y_%m) &

in my /etc/init.d called by rcS.d and all is fine.

But lines looks like this:

05 fev 14:33 SY
^M01 Action 002 code R2
^M05 fev 14:33 SY
^M07 Action 002 code R2
^M05 fev 14:33 G1
^M001 Marche Action 01
^M05 fev 14:34 G3
^M001 Marche Action 01


So, i want to remove ^M and get one line for two :

05 fev 14:33 SY 01 Action 002 code R2
05 fev 14:33 SY 07 Action 002 code R2
05 fev 14:33 G1 001 Marche Action 01
05 fev 14:34 G3 001 Marche Action 01


# cat /home/christophe/alarme/2007_02 | sed -e 's/[^M]/ /' | awk '{ if
(match($0,":")) printf "%s ", $0; else printf "%s\n", $0 }' >>
/home/christophe/alarme/$(date +%Y_%m)

seems working, so i try my new script in /etc/init.d

#! /bin/sh
echo "emulation imprimante"
cat /dev/ttyS0 | sed -e 's/[^M]/ /' | awk '{ if(match($0,":")) printf
"%s", $0; else printf "%s\n", $0 }' >> /home/christophe/alarme/$(date
+%Y_%m)>> /home/christophe/alarme/$(date +%Y_%m) &

and I get nothing...
Now, I need your help !
Thanks,
Christophe
.