/**/
parse arg args

if (args == 'sleep') then do
  call SysSleep 3
  exit
end

if (args == 'delayed_write') then do
  call SysSleep 3
  str = linein()
  say 'Got ['str'] from stdin.'
  exit
end

if (args == 'delayed_read') then do
  call SysSleep 3
  say 'Hello from child.'
  exit
end