Exclude a folder while copy in linux

let's say you have main Folder application with 3 folders inside
folderA  folderB folderC and want to exclude folderA the you can simply execute below command

rsync -av --progress application /destinationfolder --exclude folderA  

Shared library support linux

Shared libs are know by linking its path in /etc/ld.so.conf.d/

Recently i came across an error in asterisk while trying to compile OPUS codec as shared lib support to asterisk

asterisk: error while loading shared libraries: libopus.so

But OPUS was install under /usr/local/lib

Now to make it available to asterisk do

echo '/usr/local/lib' > /etc/ld.so.conf.d/usr_local.conf

then update ldconfig by
ldconfig && ldconfig -v

Redis server

Redis to run in background

redis-server --daemonize yes

WebRTC STUN check and adding multiple STUN servers

var pc = new RTCPeerConnection({iceServers: [
    {urls: 'stun:stun1.l.google.com:19302'},
    {urls: 'stun:stun2.l.google.com:19302'}
]});
pc.createDataChannel("testchannel");
pc.onicecandidate = function(e) {
  if(e.candidate){
    console.log(e.candidate.candidate);
  }
};
pc.createOffer().then(offer => pc.setLocalDescription(offer));

Adding alias in windows like in Linux

Here doskey cmd is used to set alias.
All alias set using 'doskey' are temporary, once you reopen a new cmd window its gone.

Let see how to set alias like in linux we save it in .bashrc file

IN WINDOWS
First open a notepad and past below commands to test

doskey ls=dir
doskey !=ping google.com -t
doskey mv=ren

save it as alias.cmd,
Open your run window and type %appdata% then enter. Copy the alias.cmd file to this Appdata-Roming folder.

Open regdit from your run window.
Go to HKEY_CURRENT_USER\SOFTWARE\Microsoft\Command Processor
Select 'Command processor' Folder and on the right side of window, Right click - New-Expandable string value
Give 'Name' as AutoRun, then right click and modify value as  "%AppData%\alias.cmd"

That's it! Now go to cmd prompt and do
ls and see it its working.

CentOS auto install dependencies

sudo yum --nogpgcheck localinstall package.rpm

Install asterisk 1.8.* in Ubuntu 14.04

Get the latest version of 1.8 * from asterisk download

Install dependencies
apt-get install build-essential libxml2-dev ncurses-dev libssl-dev subversion

--prefix is optional if you want to install asterisk in particular source directory
./configure CFLAGS=-pg LDFLAGS=-pg --prefix=/usr/local/

To do minimum or selected installation
make menuconfig 

make && make install
make samples && make config

To start asterisk
asterisk -i  or  /etc/init.d/asterisk start

connect to cli
asterisk -rvvvvvvvv