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File System Performance

State Of Process

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.

Init Runlevel

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    IN      SOA (
                                2006051501      ; Serial
                                10800           ; Refresh
                                3600            ; Retry
                                604800          ; Expire
                                300             ; Negative Response TTL

Magic Number

this is considered magic serial number because.
as soon as your set this number DNS reset it's counter.


File Permission notation

- 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
info.txt · Last modified: 2020/08/10 02:35 (external edit)