Hi, David wrote: > https://explainshell.com/explain?cmd=dd+if%3D%2Fdev%2Fzero+of%3D%2Fdev%2Fnul l%26+pid%3D%24! For a machine this is not a bad answer. > https://explainshell.com/explain?cmd=kill+-USR1+%24pid%3B+sleep+1%3B+kill+%2 4pid But this one missed the point quite clearly. (It gets no clue that the signals are sent to dd. So the result can only be unspecific info.) Have a nice day :) Thomas