Virtual COM port on Linux

Stuart Jansen sjansen at buscaluz.org
Mon Mar 15 12:48:55 MDT 2010


On Mon, 2010-03-15 at 12:32 -0600, Dave Smith wrote:
> After it failed to turn on the relay, here's what I did to
> investigate:
> 
> echo -n $'\xff\x01\x00' > /tmp/foo.txt
> hexdump -C /tmp/foo.txt
> 0000000 ff 01
> 
> And ls -l confirms that the file is only 2 bytes in size (not 3 as I 
> expected). Is it not possible to write a 0x00 byte as the final byte 
> using echo?

$ printf '\xFF\x01\x00' > /tmp/foo
$ od -t x1 /tmp/foo
0000000 ff 01 00
0000003

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