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Git by Examples
Reset commit
To reset commit to older version and delete all new versions do this:
1. $ git reset --hard 0d60d551
2. $ git push -f
Misc
Git by Examples
.gitignore and how to unt...
To untrack file changes do the following steps:
1. vim .gitignore
a) If you want to exclude specific file enter:
/set...
Misc
Git by Examples
Basic Settings
Configuration
Setup SSH key
First setup user's email on your local Ubuntu machine:
Misc
NodeJS By Examples
NodeJS Installation on Ce...
Installation - NodeJS on Centos 6.5
1. yum list nodejs
JavaScript
NodeJS By Examples
PM2
Start Node app with pm2 :
$ pm2 start bin/www -i 0 -n 'crawler'
-i 0 the number of instances is equal to number of proc...
JavaScript
NodeJS By Examples
Bluebird promise library
Installation
$ sudo npm install -g bluebird
Inclusion
- NodeJS
var
JavaScript
NodeJS By Examples
Promise libraries for Nod...
There are many promise NPM libraries for nodejs but two of them are the most popular:
1. q
2. bluebird
Bluebird is newer and the tw...
JavaScript
NodeJS By Examples
Promises
A Promise is an object that represents the result of an asynchronous function call and it's a valuable tool for managing asynchronous control flow.
...
JavaScript
MongoDB
Basic MongoDB Search Quer...
db.collection(collName)
.find(queryDB)
.sort({cid: -1})
Database
MongoDB
Advanced Serch Examples -...
1.
Document
{ "_id" : ObjectId("55c23b8b8b70fe4e148fea45"),  ...
Database
MongoDB
Start Mongo as a service ...
This chapter will explain how to setup mongod service on CentOS 6.5 : # service mongod start | stop | restart
1. If old rc.d script...
Database
MongoDB
mongod.lock
When starting MongoDB server
# mongod --config /etc/mongod.conf
a file /var/lib/mongodb/mongod.lock is crea...
Database
MongoDB
MongoDB Authentication
This chapter describes how to create user with password in MongoDB 2.6.10 and above.
Start / stop Mongo server
1. wi...
Database
AngularJS for dummies
Factory, service and prov...
Thanks to http://tylermcginnis.com/angularjs-factory-vs-service-vs-provider...
JavaScript
AngularJS for dummies
Angular Style Guide
https://github.com/mgechev/angularjs-style-guide#services
&...
JavaScript
Linux Basic Commands
Server resources
1. Type the following command at the shell prompt to find out top 10 largest file/directories:
# du -a /var | sort -n -r | head -n 10
Linux Server
Linux Basic Commands
Split Files
SPLITTING FILES
Split file into 1Mb per file
$ split -b 1m first_100k.csv new
Split file int...
Linux Server
Linux Basic Commands
Cron jobs
Basic commands
SYNTAX
crontab [-u user] file
crontab [-u user
Linux Server
Linux Basic Commands
Wget Options
GNU Wget is a free utility for non-interactive download of files from the Web.
It supports HTTP, HTTPS, and ...
Linux Server
Linux Basic Commands
Linux Commands
$ps -aux | grep firefox -ists all firefox processes.
$lsb_release -a -get current Ubuntu version
#grep -H -r "1click...
Linux Server
