OK, so if http://man7.org/linux/man-pages/man5/proc.5.html says:
``` On 64-bit systems, pid_max can be set to any value up to 2^22 (PID_MAX_LIMIT, approximately 4 million). ``
Its 4194304, so I will propose adding one more bulk of expressions for seven-digit PID, stating with [1-4].
OK, so if http:// man7.org/ linux/man- pages/man5/ proc.5. html says:
```
On 64-bit systems, pid_max can be set to any value up to 2^22 (PID_MAX_LIMIT, approximately 4 million).
``
Its 4194304, so I will propose adding one more bulk of expressions for seven-digit PID, stating with [1-4].