UNIX – nixCraft

Windows like Ctrl + Alt + Delete on MacOS App To Kill Tasks

May 24, 2017May 24, 2017in Mac OS X, UNIX last updated May 24, 2017

On Windows, I can hit Ctrl + Alt + Delete and kill apps or do other stuff. Sometimes Firefox browser hangs on macOS. Is there an equivalent of Ctrl + Alt + Delete keyboard shortcut to kill frozen apps on Apple macOS Sierra?

How to use sed to find and replace text in files in Linux / Unix shell

May 24, 2017May 24, 2017in BASH Shell, CentOS, Debian / Ubuntu, FreeBSD, KSH Shell, Linux, RedHat and Friends, Suse, UNIX last updated May 24, 2017

I am a new Linux user. I wanted to find the text called “foo” and replaced to “bar” in the file named “hosts.txt.” How do I use the sed command to find and replace on Linux or UNIX-like system?

How to ping and test for a specific port from Linux or Unix command line

May 23, 2017May 24, 2017in BASH Shell, CentOS, Debian / Ubuntu, FreeBSD, Linux, RedHat and Friends, Suse, Ubuntu Linux, UNIX last updated May 24, 2017

I wanted to see if a specific port of a desktop computer or server is open from a Linux or Unix command line shell. How do I ping a specific port? Is it possible possible to ping an 192.168.1.254:80 or 192.168.1.254:23 ports?

How to configure Samba to use SMBv2 and disable SMBv1 on Linux or Unix

May 18, 2017in CentOS, Debian / Ubuntu, FreeBSD, Linux, RedHat and Friends, Samba (SMB/CIFS), Suse, UNIX last updated May 18, 2017

I am a new Linux user and for security reasons and to avoid ransomware, I would like to disable the SMB1 protocol in samba configuration on a CentOS Linux version 7 server. Is it possible to disable SMBv1 on a Linux or UNIX-like operating system?

How to get domain name from URL in bash shell script

May 16, 2017May 16, 2017in BASH Shell, FreeBSD, Linux, Suse, UNIX last updated May 16, 2017

How can I extract or fetch a domain name from a URL string (e.g. https://www.cyberciti.biz/index.php) using bash shell scripting under Linux or Unix-like operating system?

How to analyze Nginx configuration files for security misconfiguration on Linux or Unix

May 14, 2017in CentOS, Debian / Ubuntu, FreeBSD, Linux, Nginx, RedHat and Friends, Security, Suse, UNIX last updated May 14, 2017

How do I install Gixy for Nginx configuration static analyzer on GNU/Linux operating system to to prevent security misconfiguration and automate flaw detection?

How to install and use vtop graphical terminal activity monitor on Linux

May 10, 2017in CentOS, Debian / Ubuntu, FreeBSD, Linux, Package Management, RedHat and Friends, Suse, UNIX last updated May 10, 2017

The vtop is a graphical activity monitor for the command line written in Node.js. How do I install vtop on my Linux server?