d : uninterruptible sleep (usually io) r : running or runnable (on run queue) s : interruptible sleep (waiting for an event to complete) t : stopped, either by a job control signal or because it is being traced. w : paging (not valid since the 2.6.xx kernel) x : dead (should never be seen) z : defunct ("zombie") process, terminated but not reaped by its parent.
0 Halt 1 Single-User mode 2 Multi-user mode console logins only (without networking) 3 Multi-User mode, console logins only 4 Not used/User-definable 5 Multi-User mode, with display manager as well as console logins 6 Reboot
First Block explained.
$TTL 3600 ; 1 hour default TTL example.org. IN SOA ns1.example.org. admin.example.org. ( 2006051501 ; Serial 10800 ; Refresh 3600 ; Retry 604800 ; Expire 300 ; Negative Response TTL )
this is considered magic serial number because.
as soon as your set this number DNS reset it's counter.
- denotes a regular file d denotes a directory b denotes a block special file c denotes a character special file l denotes a symbolic link p denotes a named pipe s denotes a domain socket