before merging with lucky

README.md

@@ -5,6 +5,8 @@
 - [what is a tty](https://www.howtogeek.com/428174/what-is-a-tty-on-linux-and-how-to-use-the-tty-command/)
 - [really handling process](https://stackoverflow.com/questions/47489128/handling-signals-sigstp-sigcont-sigint-with-child-process)
 - [signal in a child process](https://stackoverflow.com/questions/55190460/using-signals-in-a-child-process)
+- [send signal to process and childs](https://linuxconfig.org/how-to-propagate-a-signal-to-child-processes-from-a-bash-script)
+- commande utile pour tester les process parents et enfants :  while true ; do ps -o pid,pgid,cmd -C bash ; sleep 0.1 ; echo "\n" ; done
 
 ```text
                                  |     BASH       |    MINISHELL   |