Md. Sumon Islam sumonst21

Create Root CA (Done once)

Create Root Key

Attention: this is the key used to sign the certificate requests, anyone holding this can sign certificates on your behalf. So keep it in a safe place!

openssl genrsa -des3 -out rootCA.key 4096

CentOS-6 Redis PHP Session Handler

This guide is for installing redis as a replacement for the memcached php session store when using php71u IUS packages on a CentOS-6 environment.

References

Parsing JSON with Regular Expressions

When I learned of regular expression engines that support recursion I thought I could write a recursive-descent parser in regex. Since I've written JSON parsers a few times and it's a simple spec, I chose that as the test case. In the end I created two versions.

version 1

PHP 5.6 Development Environment on Ubuntu 16.04

As a PHP developer on Ubuntu, we may need to re setup our development environment sometimes. I did it already a few times, so decided to write down the steps for a typical php development environment on ubuntu. My Ubuntu version is 16.04.

	<?php

	/**
	* Find the starting Monday for the given week (or for the current week if no date is passed)
	*
	* This is required as strtotime considers Sunday the first day of a week,
	* making strtotime('Monday this week') on a Sunday return the adjacent Monday
	* instead of the previous one.
	*
	* @param string\|\DateTime\|null $date

	inotifywait -m ~/public_html -e create -e moved_to -e modify \|
	while read directory action file; do
	if [[ "$file" =~ .php$ ]] \|\| [[ "$file" =~ .htaccess$ ]]; then
	echo "File $file was $action" >> ~/watch.log
	~/watchit.sh
	fi

	done

	#
	# Monitor file $1 for changes
	# Send an alert emai to $2 if file $1 changes
	# usage: inotify_email_watcher.sh /var/log/messages [email protected]
	if [ -z "$2" ]; then
	echo "Usage: inotify_email_watcher.sh"
	exit 1
	fi
	# if the file exists
	if [ -f $1 ] \|\| [ -d $1 ]; then

	#/bin/sh
	# Usage instructions: sh find.sh php\|tr '\n' '; '
	# Then copy and paste the output and execute it
	ext=$1
	C="\u200E \u200F \u202A \u202B \u202C \u202D \u202E \u2066 \u2067 \u2068 \u2069 \u202C"
	for a in $C; do echo find . -type f -name \"*.$ext\" -exec grep -H \$\'$a\' {} \\\; ; done

	server {
	listen 80 default_server;
	listen [::]:80 default_server;
	location / {
	return 301 https://www.domain.com$request_uri;
	}
	}

	server {
	listen 443 ssl http2;

	# Get-EvengLog doesn't quite work I guess:
	# https://stackoverflow.com/questions/31396903/get-eventlog-valid-message-missing-for-some-event-log-sources#
	# Get-EventLog Application -EntryType Error -Source "DistributedCOM"
	# The application-specific permission settings do not grant Local Activation permission for the COM Server application with CLSID
	#$logs = Get-EventLog -LogName "System" -EntryType Error -Source "DCOM" -Newest 1 -Message "The application-specific permission settings do not grant Local Activation permission for the COM Server application with CLSID*"
	# 2 is error
	# 3 is warning
	$EVT_MSG = "The application-specific permission settings do not grant Local Activation permission for the COM Server application with CLSID"
	# Search for System event log ERROR entries starting with the specified EVT_MSG
	$logEntry = Get-WinEvent -FilterHashTable @{LogName='System'; Level=2} \| Where-Object { $_.Message -like "$EVT_MSG*" } \| Select-Object -First 1