sometimes surprised/confused

[ChessDoter]

hello,

far from being a power user with linux...

... i happen to play with parallel...

and get confused/surprised at times. Like so:

echo this should not happen | xargs -n 1 echo | parallel --dry-run -n 2 
echo `echo {}`

First, i was not able to separate the 4 words into different arguments 
with --colsep ' ', so that is why i used xargs in the mix.
Then, i did not expect --dry-run to allow for execution of the embedded 
`echo` command.

Ok, i can imagine scenarios, when this comes in handily...

My current conclusion is: be VERY careful with this powerful tool, test 
thoroughly before execution but even then... (can i trust it?) beware of 
unexpected side-effects.

just my 2 cents