abdallahokasha

To show all your shells, you can run:
$ cat /etc/shells

and to choose one of them 
simpliy run it directory on terminal

ex:$ /bin/bash

for more info we can check: https://bash.cyberciti.biz/guide//etc/shells

abdallahokasha

To install zsh run: (1) > sudo apt-get install zsh

We can run step (2) to see installed zsh version (2) > zsh --version in my case it was: zsh 5.1.1 (x86_64-ubuntu-linux-gnu)

And now install oh-my-zsh: (3) > sh -c "$(curl -fsSL https://raw.githubusercontent.com/robbyrussell/oh-my-zsh/master/tools/install.sh)"

abdallahokasha

It's very easy, here's how to install it on Ubuntu in 8 steps:

1- go to [Julia downloads page][1]

2- Choose you version (32bit or 64bit) from **Generic Linux Binaries**, and then download it.

3- extract .tar.gz file in home or any place you would like to install Julia on it.

4- run >  `gksudo gedit /etc/environment` on your terminal to setup envirnment path.

abdallahokasha

** First of all you should install dependencies sudo apt-get update sudo apt-get install -y build-essential sudo apt-get install -y cmake sudo apt-get install -y libgtk2.0-dev sudo apt-get install -y pkg-config sudo apt-get install -y python-numpy python-dev sudo apt-get install -y libavcodec-dev libavformat-dev libswscale-dev sudo apt-get install -y libjpeg-dev libpng-dev libtiff-dev libjasper-dev