pwillis-els

Simple Atomic File Locking in Linux

If you have access to a traditional programming language, there are many methods1 to use2 locks in linux3. However, we don't necessarily have access to those methods within a shell script. In addition, using locks over different kinds of filesystems (such as NFS) can also have inconsistencies and bugs.

What if you just want a very simple form of locking that works on all filesystems? The answer is Maildir locking. The way Qmail / Maildir works is specific to mail files, so I'll break it down in a more general way below. You also don't have to strictly follow this method; the general idea can be modified.

ibraheem4

Installing Postgres via Brew

Pre-Reqs

Brew Package Manager

In your command-line run the following commands:

1. brew doctor
2. brew update

michaljemala

package main

import (
	"crypto/tls"
	"crypto/x509"
	"flag"
	"io/ioutil"
	"log"
	"net/http"
)

rtv

#include <pthread.h>
#include <stdio.h>
#include <unistd.h>
#include <assert.h>


/* Compile like this:

 gcc --std=c99 -lpthread cond.c -o cond

da9l

$wc=new-object net.webclient
$wp=[system.net.WebProxy]::GetDefaultProxy()
$wp.UseDefaultCredentials=$true
$wc.Proxy=$wp
iex ($wc.DownloadString('https://chocolatey.org/install.ps1'))