Posted to tcl by avl at Sat Apr 22 00:51:45 GMT 2017view pretty

% open "|false | true" w+
file5
% pid file5
24512 24513
% close file5
child process exited abnormally
% set errorCode
CHILDSTATUS 24512 1

apparently the first

% open "|false | false " w+
file5
% pid file5
24551 24552
% close file5
child process exited abnormally
% set errorCode
CHILDSTATUS 24552 1

here it's the second.