[monitor@august-dev tmp]$ ./hup.pl
[monitor@august-dev tmp]$ cat hup.pid
15393[monitor@august-dev tmp]$ kill -HUP 15393
[monitor@august-dev tmp]$ cat hup.pid
15395[monitor@august-dev tmp]$ kill -hup 15395
[monitor@august-dev tmp]$ cat hup.pid
15395[monitor@august-dev tmp]$ kill -hup 15395
[monitor@august-dev tmp]$ cat hup.pid
15395[monitor@august-dev tmp]$