»Tag: Unix

Check and Print Who Is Logging In in Linux / Unix

In Linux and UNIX operating system such as Ubuntu, Red Hat Enterprise Linux, Solaris, FreeBSD, CentOS and other distributions, many users can login to the system concurrently, by using Telnet and/or SSh (Secure Shell) to logon remotely, [...]

By | 2016-12-10T21:38:50+00:00 December 10th, 2016|Categories: Linux|Tags: , , |0 Comments

How to Change or Spoof MAC Address in Windows / Windows Server / macOS / Unix / Linux

MAC address (Media Access Control address) is a quasi-unique identifier consists of a six byte number that attached to most network adapter card or network interface card (NIC). As such, all network cards, whether it's of Ethernet [...]

By | 2018-03-30T17:54:44+00:00 March 30th, 2018|Categories: Security|Tags: , , , , , |36 Comments

Disable and Turn Off Telnet in Linux

Telnet is an unsecured network protocol that facilitates remote login to a server via network connection. The protocol allows server to be located thousands of miles away from the administrator yet still can be managed even without [...]

By | 2018-03-15T02:02:18+00:00 March 15th, 2018|Categories: Linux|Tags: , , , , |0 Comments

How to Check if Telnet Is Running on a Server

Telnet (TELecommunication NETwork) is a unsecured network protocol used on the Internet or local area network (LAN) connections popularly to remotely access a server from client. The problem with Telnet is that the session is unencrypted with [...]

By | 2016-12-09T08:39:33+00:00 December 9th, 2016|Categories: Linux|Tags: , , , , |1 Comment

Change Group Ownership of Symbolic Links in Unix or Linux

chgrp can be used to change group ownership of files and directories in almost all UNIX-variant platforms, including Linux such as Fedora Core, CentOS, Red Hat Enterprise Linux, Ubuntu, Debian and etc. However, if you try to [...]

By | 2016-12-25T14:21:42+00:00 December 25th, 2016|Categories: Linux|Tags: , |4 Comments

How to Mount USB Disk Drive in UNIX or Linux

Most distros (distributions) of Linux include Mandrake 10.1, SuSE 9.x and Fedora Core 3 can now support plug-and-plug detection, discovery and driver installation for portable USB drive or USB disk (and any type of USB-based data storage [...]

By | 2016-12-09T08:41:30+00:00 December 9th, 2016|Categories: Linux|Tags: , , |6 Comments

Refresh Linux or Unix Path Environmental Variables with rehash

If you have install new applications in Unix or Linux operating system, the rehash command can be used to recomputes the internal hash table of the contents of directories listed in the path environmental variable to account [...]

By | 2016-12-09T08:43:11+00:00 December 9th, 2016|Categories: Linux|Tags: , |2 Comments

Find Files that are Modified Today (or Since Certain Time Ago) in Unix & Linux

To find all files that was modified since a specific time ago (i.e an hour ago, a day ago, 24 hours ago, a weeks ago and so on) in Unix and Linux environment, the find command will [...]

By | 2017-01-01T22:20:47+00:00 January 1st, 2017|Categories: Linux|Tags: , |23 Comments