Bash scripting: feed etherwake program with text file

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http://ubuntuforums.org – Hi all! I know this is a very stupid question for a programmer but I am not able to find a solution. I have a program: etherwake. It is used to wake on lan a PC using its mac address. I simply want to "feed" etherwake with a mac address contained in a text file. I've tried cat filename | etherwake etherwake < `cat filename` without any kind of luck... I always get: Specify the Ethernet address as 00:11:22:33:44:55 Of course if I do a cimple cat filename I get a perfect mac address, without blank spaces or any kind of strange characters. What am (Hardware)