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# Install Raspbian SO, you can get it at https://www.raspberrypi.org/documentation/installation/installing-images/
# Connect to a screen and login onto the raspberry, user "pi", password "raspberry"
# Activate the SSH server running the command:
sudo raspi-config
# Select and then 7-Advance Options -> Expand Filesystem
# Select and 5-Interfacing Options -> Activate the SSH server.
# Also want to 4-Localisation Options -> configure the WiFi country; at select and select your contry.

# After those changes you need to reboot the machine.

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# Doc from https://wiki.gentoo.org/wiki/SSH_jump_host
ssh -J jump_named_configured_at_conf,user@host_jump user@end_machine

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# On a docker container force to not reach Internet/connectivity
# The docker must be started as a privileged with the param --privileged and
# on the running container, you must have iptables installed (apt-get install iptables),
# then you can run:

# To avoid all connectivity at all
iptables -A OUTPUT -j DROP
# Avoid all connectivity on a specific interface
iptables -A OUTPUT -o eth1 -j DROP
# Avoid connectivity to a specific IP

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# View the source code of any function in use directly at the debugger, useful to be sure what code are you executing
import inspect
print(''.join(inspect.getsourcelines(NAME_OF_METHOD_TO_SEE_SOURCE_CODE)[0]))

# Create a virtual environment with a specific python version

virtualenv --python=/usr/bin/python2.7 ~/.virtualenvs/test

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-- Look for a table filtering by the name (MySql)
-- If you already has the database selected
SHOW TABLES LIKE '%_name'

-- If the database is not selected
SELECT TABLE_NAME 
FROM INFORMATION_SCHEMA.TABLES
WHERE TABLE_NAME like '%_name'
and TABLE_SCHEMA = 'your_db_name'

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# Goto the end of file Alt + /

# Goto specific line Ctrl + _

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# Force a shellscript to run from its folder, instead the current directory
# folder where was called from. Useful to use relative paths.

# Set the folder to project, no matter from where the script was called.                                                                                                    
SCRIPT_DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"                                                                                                              
pushd $SCRIPT_DIR

# Test the connectivity from a machine to another and the port
nc -vv 192.168.1.200 80

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#    _____      _                    
#   |  __ \    | |                   
#   | |__) |___| |__   __ _ ___  ___ 
#   |  _  // _ \ '_ \ / _` / __|/ _ \
#   | | \ \  __/ |_) | (_| \__ \  __/
#   |_|  \_\___|_.__/ \__,_|___/\___|
#
# At the branch containing all the changes you must run...
git checkout BRANCH_WITH_ALL_CHANGES
git rebase -i BRANCH_TO_PUT_CHANGES_INTO

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# In the first machine just execute the tool netcat with the port to test and in listening mode
nc -lp 8080

# In the second machine just execute also the netcat but connecting to the previous machine by IP
# or and nameserver, and to the same port
nc 123.123.123.123 1 8080

# From now on all wrote in any machine must appear at the other after INTRO
# This can be used to test connectivity issues between machines, docker containers, etc.

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# After open a lot of console windows with the csshX (ClusterSSH), if the windows are too small to work with,
# then is better to resize the consoles and view only one (the rest will be also executing the same commands)
# in order to be able to work for example with some editors and other stuff.

# move the console to 0,0
printf '\e[3;0;0t'

# resize to 27x85 characters (laptop)
printf '\e[8;27;85t'