$ perl -e 'system("echo -e "\xFF\x08\x00" >> /dev/ttyACM0");'
Backslash found where operator expected at -e line 1, near ""echo -e "\"
	(Missing operator before \?)
Backslash found where operator expected at -e line 1, near "xFF\"
Backslash found where operator expected at -e line 1, near "x08\"
String found where operator expected at -e line 1, near "x00" >> /dev/ttyACM0""
syntax error at -e line 1, near ""echo -e "\"
Execution of -e aborted due to compilation errors.

##</code><code>##

$ perl -e 'system q{echo -e "\xFF\x08\x00" >> /dev/ttyACM0};'
sh: /dev/ttyACM0: Permission denied

##</code><code>##

$ perl -e 'system q{echo -e "\xFF\x08\x00" >> ~/foo };'
$  cat ~/foo
-e &#65533;
$

##</code><code>##

# perl -e 'system q{echo -e "\xFF\x08\x00" >> ~/foo };'
# cat ~/foo
&#65533;
#