==== File System Performance ====
[[http://www.redhat.com/magazine/008jun05/features/schedulers/|File System Scheduler]]
==== 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
==== Named ====
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
)
=== Magic Number ===
this is considered magic serial number because.\\
as soon as your set this number DNS reset it's counter.
2147483647
==== 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