UNIX – nixCraft

How to change or configure OpenBSD package install mirror

August 16, 2017in Openbsd, Package Management, UNIX last updated August 16, 2017

openbsd commandI am trying to install nginx server on OpenBSD but keep getting an error that read as follows when I run the pkg_add command:

https://mirror.leaseweb.com/pub/OpenBSD/6.1/packages/amd64/quirks-2.304.tgz” title=”quirks-2.304.tgz: ftp: Error retrieving file: 404 Not Found
signify: gzheader truncated
https://mirror.leaseweb.com/pub/OpenBSD/6.1/packages/amd64/nginx-1.10.2p2.tgz” title=”nginx-1.10.2p2.tgz: ftp: Error retrieving file: 404 Not Found
signify: gzheader truncated

How do I change or configure OpenBSD package install mirror for the pkg_add command?

How to test PHP 7 and WordPress MySQL/MariaDB Database connectivity using a PHP script

August 15, 2017August 15, 2017in Linux, MySQL, PHP, UNIX last updated August 15, 2017

I wanted to test if my PHP 7 and MySQL/MariaDB for WordPress are working. If not I wanted to see some error on screen or for my monitoring system. How to write a script for a quick PHP MySQL DB connection test for WordPress or any other database and send an email or text when site is down?

How to check and verify md5/sha1/sha256 checksums for Apple MacOS X when I download files

June 30, 2017June 30, 2017in BASH Shell, Mac OS X, Security, UNIX last updated June 30, 2017

Malware is becoming more and more common for macOS. I wanted to make sure file I downloaded files such as an ISO image or firmware are safe before install on my system. How do I verify md5 or sha1 or sha256 checksums for my Apple MacOS X when I download files from the Internet?

How to write Raspbian Jessie image file to SD cards on Apple macOS / OS X

June 27, 2017June 27, 2017in Linux, Mac OS X, Raspberry Pi, UNIX last updated June 27, 2017

I got a Raspberry PI 3 from my friend. I am a long term macOS user. How do I write Raspbian image file to SD card using macOS?

How to display countdown timer in bash shell script running on Linux/Unix

June 24, 2017June 24, 2017in BASH Shell, Linux, UNIX last updated June 24, 2017

I want to display a countdown before purging cache from CDN network. Is there an existing command to show a conuntdown from 30..1 as 30,29,28,…1 on Linux or Unix bash shell script?

How to add ZIL write and L2ARC read cache SSD devices in FreeNAS

June 24, 2017in File system, FreeBSD, FreeNAS, UNIX last updated June 24, 2017

How do I add the write cache called the ZIL and read cache called L2ARC to my my zroot volume? How do I extend my existing zroot volume with ZIL and L2ARC ssd disks of FreNSA server?

How to find and delete directory recursively on Linux or Unix-like system

June 20, 2017June 22, 2017in BASH Shell, Linux, UNIX last updated June 22, 2017

I type ‘find . -type d -iname foo -delete‘ command to find the foo directories and delete them. However, I am getting an error message that read as find: cannot delete './hourly.4/data/foo': Directory not empty on Linux server. How do delete directories based on find command output on Linux or Unix-like system?