Alvaro Figueiredo alvfig

😀

tackling side projects in the off-hours

a regular guy on the shell

alvfig / auto_cleanup.sh

Last active October 16, 2018 17:37

A very simple lock system to avoid multiple instances of the same process

	#!/bin/bash
	# auto_cleanup.sh - simple lock system

	LOCKFILE="auto_cleanup.pid"

	# Check for another instance
	if [[ -e "$LOCKFILE" ]] && pgrep -F "$LOCKFILE" > /dev/null; then
	echo "there is another active instance" 1>&2
	exit 1
	fi

alvfig / easter.js

Created August 17, 2018 03:36

Evaluation of the Easter day

	// easter.js
	// Gauss Algorithm
	// https://pt.m.wikipedia.org/wiki/Cálculo_da_Páscoa
	//
	exports.easterSunday = function(year) {
	var X=0;
	var Y=0;

	if (year>=1582 && year<=1699){X = 22; Y = 2;}
	if (year>=1700 && year<=1799){X = 23; Y = 3;}

alvfig / cactorial.c

Last active October 22, 2018 03:05

Factorial snippets

	/* cactorial.c - evaluates factorial */

	#include <stdio.h>
	#include <stdlib.h>

	double recursive_factorial(int n) {
	if (n <= 0)
	return 0;
	if (1 == n)
	return 1;

alvfig / fibonacci.py

Last active August 16, 2018 06:43

Fibonacci sequence snippets

	#!/bin/python
	"""Fibonacci sequence snippets"""


	# Python 2 compatibility
	from __future__ import division, print_function


	import argparse
	import math

alvfig / oldest_file.sh

Last active May 6, 2019 03:18

Shell script routine to pick the oldest file on a directory tree

	#!/bin/sh

	oldest_file()
	{
	local dir="$1"
	[ -d "$dir" ] \|\| dir="."
	find "$dir" -type f -printf '%T+ %p\n' \| sort \| awk '{print $2; exit}'
	}

	oldest_file "$@"

alvfig / date_arithmetic.sh

Last active September 30, 2017 23:07

Shell routines for date arithmetic