How to Flush Memory Cache on Linux Server

Many times systems faced low memory issues of Linux systems running a while. The reason is that Linux uses so much memory for disk cache is ...

Building and Installing HHVM on CentOS 7

What's HHVM? HHVM is an open-source virtual machine designed for executing programs written in Hack and PHP . HHVM uses a just-in-tim...

Simple BASH-based Queue System

I'm rather new to the entire Linux shell scripting world. After a brief look into BASH (Bourne-Again Shell), the default shell used in ...

parallelism or multiple threads in BASH

I was working on a Nagios check the other day, which was looping over a number of items and assessing their status. I found that the check ...

Linux create a select menu in a shell script

#!/bin/sh show_menu(){ NORMAL=`echo "\033[m"` MENU=`echo "\033[36m"` #Blue NUMBER=`echo "\033[33m"...