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Sandip Bhattacharya sandipb

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sandipb /
Created May 10, 2023 21:25
Script to decrypt PDFs using qpdf. Will ask for password only if needed.
set -e -o pipefail
usage() {
cat <<HELP
Decrypts given pdf file usingh qpdf by prompting for a password.
sandipb /
Created April 22, 2023 06:58
How to enable a linux host to route between two lans
# $PRIVATE_IF is private lan, $PUBLIC_IF is public lan
# the interface which is connected to the interface.
# The default route of this host is already set via this interface
# The interface connecting to the internal lan, which needs this host to be a router to the Internet
sandipb / create new django
Last active March 13, 2023 17:52
Creating new django project
View create new django
$ mkdir dtemp
$ cd dtemp
$ poetry init
This command will guide you through creating your pyproject.toml config.
Package name [dtemp]: Django Test
sandipb / age_sorted_names.pp
Created July 20, 2022 13:31
Puppet sort hash
View age_sorted_names.pp
$data = [
{'name'=> 'emily', 'age'=> 6},
{'name'=> 'john', 'age'=> 5},
{'name'=> 'jade', 'age'=> 4},
{'name'=> 'grant', 'age'=> 2},
function age_sorted_names($ar) >> Array {
$ |$idx, $entry| {
[$entry['age'], $entry['name']]
sandipb /
Last active May 5, 2022 02:46
Fix cups-pdf not printing PDFs with restrictions

Fix problem when cups-pdf (actually Ghostscript) refuses to print PDF files with restrictions

Specifically, even if the file has no printing restrictions, like many government forms do (my specific itch), Ghostscript refuses to print the file and generates a blank pdf.

Steps to fix

  1. Put contents of in an executable file named /usr/lib/cups/filter/unblockprint. Make sure that the permissions of this file matches others in the same directory.
  2. Put local.convs in /etc/cups
sandipb / playbook.yml
Created September 27, 2021 22:58
Get non-matching kernels on all hosts using ansible
View playbook.yml
- hosts: ubuntu
gather_facts: yes
kernel_does_not_match: "{{ (ansible_distribution == 'Ubuntu') and ( ansible_kernel != '5.4.0-86-generic') }}"
output_path_local: /tmp/host_kernels
- block:
- name: Add matching host to file
sandipb /
Last active August 5, 2020 10:35
Example code to use the Golang httprouter library
sandipb /
Created June 21, 2020 11:37
Bash script to generate new server certificates and private key, for the OpenSSL Certificate Authority guide by Jamie
# set -x
set -e
cd $(dirname $0)
# The path to the homebrew install on mac. Change to point to your own installation
NAME=${1:?Need a hostname for generating certs}
export SAN="DNS:$NAME"
sandipb /
Created June 12, 2019 00:32
Benchmarking json loading across json and ujson (precision floats and normal)
import json
import ujson
from timeit import repeat
def decode_json(data):
def decode_ujson(data, precise=False):
sandipb /
Last active June 11, 2019 23:59
ujson repr trips up json dumps
from __future__ import print_function
import ujson, json
data = '{ "prod-lsg1": { "max_float": 0.0046288111 } }'
print("json dumps, w/o precise float: ", json.dumps(ujson.loads(data)))
print("json dumps, w/ precise float: ",json.dumps(ujson.loads(data, precise_float=True)))
print("ujson dumps, w/o precise float: ", ujson.dumps(ujson.loads(data)))
print("ujson dumps, w/ precise float: ",ujson.dumps(ujson.loads(data, precise_float=True)))