Kalanand's January 2015 Log

January 7th

How to manually sync clock on vm

  sudo apt-get install ntp
  date 
  sudo service ntp stop
  sudo ntpdate -s time.apple.com       #(or alternatively from 'time.nist.gov')
  sudo service ntp start
  date 

January 8th

Converting integer address to IP address and vice versa

$python
>>> from struct import pack
>>> from socket import inet_ntoa

>>> inet_ntoa(pack('>I', 2818768998))
'168.3.0.102'

>>> inet_ntoa(pack('I', 2818768998))
'102.0.3.168'

>>> unpack('I', inet_aton('1.1.18.18'))
(303169793,)

>>> unpack('I', inet_aton('255.255.18.18'))
(303235071,)

>>> unpack('I', inet_aton('1.0.18.18'))
(303169537,)

January 12th

How to convert a running job to nohup

• Step 1: ctr^z (to suspend the job)
• Step 2: bg (to run the job in background)
• Step 3: disown -h %1 (assuming this is the first running job in the list, check the screen message after ctr^z to make sure)

January 15th

To attach a running process to gdb

  gdb -p <process_id>

  gdb -p `pgrep col`

January 20th

http.host contains <host_name>
http.host contains marvel.com

January 26th

   200−299                        0.85 ± 0.20  (Abnormal if below a few %)
   300−399 except 301,302,304     0    ± 0.001 (Abnormal above 1%)
   301, 302                       0.13 ± 0.05  (Abnormal above 35%)
   304                            0.02 ± 0.04  (Abnormal above 20%)   
   400−499                        0    ± 0.001 (Abnormal above 1%)
   0−199, 500−above               0    ± 0.001 (Abnormal above 1%) 

Go to December's log