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Strings are chains of characters, sample of a string is :

I am a string

Strings representation

String can be represented with double quotes

"I am a string"

or with single quotes

´I am a string´

Strings concatenation

Strings can be concatenated with  the plus simbol :  +

Homebrew is a package manager, that can be used in OS X. In order to install it please follow this process

Process

1. At the terminal please type the next command

ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"

2. Enter your machine password if required

Reference

http://brew.sh