Why is a virtual terminal “virtual”, and what/why/where is the “real” terminal?


I edited a crontab with the command sudo crontab -e and I inserted the line */1 * * * * /home/user/Desktop/bt.sh >> /home/user/logroot.txt 2>&1 The script contains:

#!/bin/bash pkexec env DISPLAY=$DISPLAY XAUTHORITY=$XAUTHORITY bluetooth-sendto --device=xx:xx:xx:xx:xx:xx /home/user/send.txt

this because the command bluetooth-sendto doesn't work inside a crontab because I get this error: error: XDG_RUNTIME_DIR not set in the environment. in the logroot.text, after the execution of the script, there is:

/home/user/Desktop/bt.sh: line 2: 3981 Hangup pkexec env DISPLAY=$DISPLAY XAUTHORITY=$XAUTHORITY bluetooth-sendto --device=xx:xx:xx:xx:xx:xx /home/user/send.txt

Other Tips. We have a legacy server, it's internal, and there is no way I'm going to be able to update PHP, so that's not an option. Currently it runs 5.3.3. The command cat /etc/issue returns Amazon Linux AMI release 2016.03 - but I think that is a CentOs. A phpinfo() call shows the information below...

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Unless FreeBSD has been configured to automatically start a graphical environment during startup, the system will boot into a command line login prompt, as seen in this example:

FreeBSD/amd64 (pc3.example.org) (ttyv0) login:

The first line contains some information about the system. The amd64 indicates that the system in this example is running a 64-bit version of FreeBSD. The hostname is pc3.example.org, and ttyv0 indicates that this is the “system console”. The second line is the login prompt.

Since FreeBSD is a multiuser system, it needs some way to distinguish between different users. This is accomplished by requiring every user to log into the system before gaining access to the programs on the system. Every user has a unique name “username” and a personal “password”.

To log into the system console, type the username that was configured during system installation, as described in Section 2.8.6, “Add Users”,...

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In this tutorial i will show you that how to use Virtual terminal on Proteus using Arduino Uno for Arduino simulation in Proteus you need to Update the Library of Proteus

Click Here and Learn How to Update!

i Declared the 9 and 10 pin as Tx Rx Pins in code the Rest of the Code is very Simple .



SoftwareSerial mySerial(9, 10);

void setup()
mySerial.begin(9600); //set baud rate of Virtual terminal
int a = 0;
void loop()
a ++;
if(a > 0 && a < 4 )
mySerial.println("Hi Hello Electronics Lovers"); //Text you want to send
if(a > 0 && a < 4 )

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This article is about a standardized term. For the user interface concept, see

virtual console


In open systems, a virtual terminal (VT) is an application service that:

Allows host terminals on a multi-user network to interact with other hosts regardless of terminal type and characteristics, Allows remote log-on by local area network managers for the purpose of management, Allows users to access information from another host processor for transaction processing, Serves as a backup facility.

PuTTY is an example of a virtual terminal.

ITU-T defines a virtual terminal protocol based on the OSI application layer protocols. However, the virtual terminal protocol is not widely used on the Internet.

Virtual Terminals for payment card processing[edit]

This term is also used to refer to web interfaces for processing card not present transactions. Such terminals allow call centre agents to enter a customer's credit card details to take a...

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Windows Terminal Services (which was renamed Remote Desktop Services in Windows Server 2008 R2) has been around for many years. But lately, I've seen an increase in the number of organizations that use it. Here are a few reasons why.

Note: This article is also available as a PDF download.

1: The hardware has finally caught up

When Terminal Services debuted with Windows NT, server hardware was hard pressed to support multiple server sessions. Furthermore, 10 Mbps networks were still the standard at that time and could easily become saturated by network-intensive applications, such as Terminal Services. Today, server hardware is far more powerful than it has ever been, and running multiple operating system instances on a server is the norm. Today's servers are well equipped to handle the demands of hosting Terminal Service sessions.

2: Windows Server 2008 R2 offers a full VDI solution

Windows Server 2008 R2 allows administrators to deploy a full...

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In today’s economy, processing transactions can not possibly be limited to face-to-face retail interactions, as customers use various devices to shop and pay for their purchases. As the demand for more convenient payment solutions rises, businesses introduce new ways to accept and process payments to stay competitive. As electronic devices become more and more ingrained with our day-to-day lives, companies look for technology solutions that can provide answers to their business needs. The ability to accept and process payments on a computer via a payment portal is a solution developed to address companies’ offsite/remote payment processing needs, especially those businesses with limited direct interaction with their customers. A virtual terminal, therefore, is a piece of software that turns your computer into a payment terminal, giving you the ability to enter payment information and process payments online.

A payment terminal:

is software that is hosted online, usually...
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A virtual terminal is the link merchants need to accept credit card and ACH payments online securely and efficiently from their own computer. TransFirst® offers an easily accessible virtual terminal through Transaction Express®, our front-end payment platform.

A virtual terminal can be used to process credit card and ACH transactions from any computer with Internet access anywhere in the world, allowing you to securely and efficiently handle a series of additional tasks including the verification, reporting and processing of credit card and ACH payments.

How Transaction Express Works

With an Internet merchant account from TransFirst, you can use your computer’s web browser, an Internet connection and a USB credit card swipe reader to log into the Transaction Express secure website and perform a variety of functions, including:

Process swiped retail credit card transactions Manually enter mail order/telephone order (MOTO) credit card transactions Manually...
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A COM port redirector (tty port redirector under Unix/Linux) is specialized software (often including device driver and user application) that includes the underlying network software necessary to access networked device servers that provide remote serial devices or modems.


The purpose of the redirector is to make the virtual COM port exhibit behavior that closely resembles that of a "real" COM port, i.e., a COM port driver for local serial port hardware. A virtual COM port itself is a relatively simple software mechanism that can be implemented by driver software similar to that of a conventional COM port driver. The main challenges arise in two other areas: the network connection to the device server and the behavior of the device server. These issues are described in the Technology section below.

Applications use a COM port redirector through one or more virtual COM ports that the redirector creates, as configured by the user. When the...

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The main-frame computers to which old text terminals were connected to were not considered to be "servers". They were just part of the computer system just like a monitor doesn't connect to a server PC. Virtual terminals are not real text-terminals but are emulated text-terminals. It's important to include the word "text" since they are not GUI terminals (sometimes called thin Clients).

Virtual terminals are nice since one can set up each one to have a different color display by putting the "setterm" program in say the /etc/rc-local file that runs at boottime. Then one may use one virtual terminal to run a script that does something that fails; Use another terminal to change the configuration that might fix the problem; Use still another terminal to look up documentation regarding the problem; use another terminal to go on the Internet with a text browser to help solve the problem, etc., etc. Since each screen has a different color background, seeing the right color assures...

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Container Terminal Bremerhaven controlled by a Terminal Operating System (TOS) realtime Animation, Simulation, Emulation done by CHESSCON Virtual Terminal.

CHESSCON Virtual Terminal provides a 3D model of a complete container terminal with all of its equipment and reacts like a real terminal. The software's open architecture allows you to easily connect to any existing Terminal Operating System (TOS). This is the most up-and-coming way to test TOS functionality without disturbing the real operation, which improves your terminal's productivity, availability and stability. Make more moves without burning fuel and making noise or emissions. An advantage like this can only be achieved through the utilization of a virtual terminal. For the testing of new TOS releases, look no further. CHESSCON Virtual Terminal speeds the start-up phase of a new terminal and brings the control staff to an expert level of operational...

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