Did you try it? The documentation of Bash is not clear. I think it 
says that a bash script can only wait the processes it has launched. 
Does it mean it maintains a list of them, or is it just the consequence 
of the fact that any process but pid1 cannot adopt others' children? In 
the last case, why the need to repeat it.

     Obviously the author of the documentation didn't envision the case 
of bash running as pid1 :-)

     Didier