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BASH login vs non-login shell

login-shell

like in remote SSH reads ~/.bash_profile, ~/.bash_login, and ~/.profile, in that order.

non login shell

like in Terminal in GUI reads /etc/bash.bashrc and ~/.bashrc

.profile

contains general things like the environment variables

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ssh and friends

I use SSH as a powerful tool that it deserves its own gist.

SSH proxy SOCKS

Create a dynamic port:

ssh -fNCq -D 8123 -p 22 [email protected]

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Frequently used git commands

hard reset:

git fetch --all
git reset --hard origin/master

undo local changes of a file match origin master:

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Running Jupyter at boot in OSX using launchctl

Create a plist file in your user directory. In the following change USERNAME to your own.

/Users/USERNAME/Library/LaunchAgents/local.jupyter.notebook.plist

With this content:

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SDR Topics

Software Defined Radio

Link to software:

Good page with description:

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Python Flask + nginx + gunicorn

Setting up a python flask web application using nginx, gunicorn and systemd on a Rasperry Pi

In the following, we assume a working Flask application with the name of SCRIPT_NAME. First we need to install a couple of things:

sudo apt-get update && sudo apt-get upgrade

Installing nginx will fail if apache is running. If your installation breaks half ways, then remove the fragments, stop apache (and I actually suggest removing it in case not needed) and then install nginx again:

sudo apt-get remove nginx* --purge

sudo /etc/init.d/apache2 stop

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Python snippets

numpy genfromtxt using names

You can plot all columns of a CSV file at once using the structured array. Assuming that your file looks like this

# col1 | col2
0.34 | 0.134
1.4 | 1.5

you then use:

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Android rooting how to

Heimdal

heimdall flash --RECOVERY ./clockworkmod_6.0.3.2_jfltespr.img --no-reboot

note that the word RECOVERY should be written in all upper case

Installing APKs

You can install APKs in a loop:

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linux password recovery

under debian

• interrupt the boot process by any key
• in the boot menu press 'e' for edit
• add init=/bin/bash after ro quiet in the line that begins with linux
• press ctrl-x
• type mount -rw -o remount / dont't forget the trailing slash
• use passwd to change to a new password

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# show number notation
def get_number_notation(value, decimal_place=2, unit=''):
    ref = {24: 'Y', 21: 'Z', 18: 'E', 15: 'P',
           12: 'T', 9: 'G', 6: 'M', 3: 'k', 0: '',
           -3: 'm', -6: 'u', -9: 'n', -12: 'p',
           -15: 'f', -18: 'a', -21: 'z', -24: 'y',
           }
    num = max([key for key in ref.keys() if value > 10 ** key])
    mult = ref[num] if unit else 'e{}'.format(num)
    return '{}{}{}'.format(int(value / 10 ** num * 10 ** decimal_place) / 10 ** decimal_place, mult, unit)