Apply style to IE11 only

Put the style in this media query:

@media screen and (-ms-high-contrast: active), (-ms-high-contrast: none) {
    // Put CSS here
}

View print output immediately

Add PYTHONUNBUFFERED=1 in run config or .env (only use .env if you use the plugin). This is meant to immediately view the output …

ZBell

Useful to have a notification when a long command completes.

To enable it, add zbell to your plugins array if you are using oh-my-zsh or source the definition file.

To configure:

• The minimum time commands must take for the notification to happen, use: ZBELL_DURATION. For instance ZBELL_DURATION …

Scripts

Use this at the top of all your Bash scripts to avoid problems:

# Exit on error.
set -e
# Don't allow undefined variable.
set -u
# Make pipeline fail if any command in it fail.
set -o pipefail

Signals

See this article.

Use an editor

By default there is no editor on Heroku. To get one, you can use the heroku-nano plugin like this (or by installing as a plugin):

mkdir bin
cd bin
curl https://github.com/Ehryk/heroku-nano/raw/master/heroku-nano-2.5.1/nano.tar.gz --location --silent > nano.tar …

Inspect TLS certificates with requests

Use the snippet below to capture and inspect the certificates of a distant site and its chain with requests.

import requests

HTTPResponse = requests.packages.urllib3.response.HTTPResponse
orig_HTTPResponse__init__ = HTTPResponse.__init__
def new_HTTPResponse__init__(self, *args, **kwargs):
    orig_HTTPResponse__init__(self, *args, **kwargs …