bsnux

#!/usr/bin/env bash
set -euo pipefail

claim=$1
ns=$2
pod_name="pvc-inspector"

kubectl get po "$pod_name" -n "$ns" && kubectl delete po "$pod_name" -n "$ns"

cat <<EOF | kubectl apply -f -

bsnux

# Reading file lines from stdin
cat /tmp/test.txt | python -c 'import fileinput; [print(line, end="" for line in fileinput.input()]
python -c 'import fileinput; [print(line, end="") for line in fileinput.input()]' < /tmp/test.txt

# Printing the 3 lines of the file
python -c "import sys; sys.stdout.write(''.join(sys.stdin.readlines()[:3]))"  < /tmp/test.txt

# Checking if file exists
python -c 'from pathlib import Path; print("yes") if Path("/tmp/metrics.txt").is_file() else print("no")'

bsnux

#!/bin/bash
#
# Creates a new TypeScript project ready to use with Node.js
set -euo pipefail

if [[ ! -f $(which npm) ]] || [[ ! -f $(which yarn) ]]; then
    echo "Please, install npm and yarn before continuing"
    echo "See https://docs.npmjs.com/downloading-and-installing-node-js-and-npm"
    echo "See https://yarnpkg.com/"
    exit

bsnux

# Starting REPL
perl -del

# Search and replace in place
perl -p -i -e "s/test/testing/g" /tmp/testing.txt

# Search/replace in specific files in a directory
perl -p -i -e 's/oldstring/newstring/g' `find ./ -name *.html`

# Similar to awk

bsnux

import java.util.ArrayList

def MAX_TO_KEEP = 10
def JOB_NAME = "job_name_here"

def hi = hudson.model.Hudson.instance
def item = hi.getItemByFullName(JOB_NAME)
def jobs = item.getAllJobs()

Iterator<?> iterator = jobs.iterator()

bsnux

Getting number of CPU processors in different languages

ruby -retc -e 'puts Etc.nprocessors'

python -c "import multiprocessing; print(multiprocessing.cpu_count())"

bsnux

#!/bin/bash
# How to download a release file from a private GitHub repo

set -eou pipefail

TOKEN="<your_github_token>"
API_URL="https://api.github.com/repos/<your_repo_here>"

asset_id=$(curl -s -H "Authorization: token $TOKEN" -H "Accept: application/vnd.github.v3.raw" $API_URL/releases \  
  | jq '.[0].assets[0].id')

bsnux

#!/bin/bash
#
# Set zsh as default shell when auth is done by LDAP
#
set -eou pipefail
getent passwd afernandez | perl -pne 's/bash/zsh/' | sudo tee -a /etc/passwd

bsnux

Creating Python Standalone Applications with zipapp

zipapp module allows us to create self-contained Python standalone programs that can be distributed to users who have Python already installed on their system.

Python packages not using C extensions can be bundled as well. shiv is recommended for those applications using those kind of extensions. In general, if your dependencies don't require a C compiler, you should be good to go using zipapp module.

Simple aplication listing current directory content

bsnux

#!/bin/bash
#------------------------------------------------------------------------
# run-cmd-pod.sh
#
#  Runs commands in K8s pods when those are not installed there
#  but they're in the worker node.
#
#  Motivation: You want to run a command in a pod without
#  installing anything in the pod. If that command exists
#  in the worker node running the pod, then you can use