Install Graphviz and PyGraphviz on Mac

Use brew to install graphviz, then add install option when using pip to install pygraphviz

brew install graphviz

pip install pygraphviz –install-option=”–include-path=/usr/local/lib/graphviz/” –install-option=”–library-path=/usr/local/lib/graphviz”


Shell – Check SSL Certificate

Just a few minutes after trying to check domain’s SSL Certificate expiry date with python which requires around ten lines of code, I found a shell script which doing that task in just one line, here’s the script


echo | openssl s_client -servername -connect 2>/dev/null | openssl x509 -noout -dates



Python – Check SSL Certificate Expiry Date

Just playing with python 3 to make a simple utility to check my domain expiry date

# save as

import OpenSSL
import ssl, socket
import argparse

# get domain
parser = argparse.ArgumentParser()
args = parser.parse_args()
domain = args.domain

# get SSL Cert info
cert = ssl.get_server_certificate((domain, 443))
x509 = OpenSSL.crypto.load_certificate(OpenSSL.crypto.FILETYPE_PEM, cert)
x509info = x509.get_notAfter()

exp_day = x509info[6:8].decode(‘utf-8’)
exp_month = x509info[4:6].decode(‘utf-8’)
exp_year = x509info[:4].decode(‘utf-8’)

exp_date = str(exp_day) + “-” + str(exp_month) + “-” + str(exp_year)

print(“SSL Certificate for domain”, domain, “will be expired on (DD-MM-YYYY)”, exp_date)

then run with the domain you want to check as the argument



Pug render variable twice

recently, I want to pass this variable to the view

passedVars.metaOgUrl = '<meta property="og:url" content="' + originalUrl + '">';

and use the usual way of rendering variable in pug


but it render the tag twice, a simple googling then found the answer, use != character as prefix


it’s rendered normal now