Wireshark · Wireshark-users: [Wireshark-users] Tshark and using display filters

["Irakli Natshvlishvili" <iraklin@xxxxxxxxx>]

I have a capture file, want to use tshark to filter packets and write a new file. 

When I use 

tshark -r all.cap -w filtered.cap -R udp contains "100"

'I'm getting 

tshark Read filters were specified both with "-R" and with additional command-line arguments

Platform is XP with SP2. What I'm doing wrong?

-- 
I.N.