ARMONK, N.Y., Nov. 20, 2014 /PRNewswire/ -- IBM (NYSE: IBM) today announced that it is bringing a greater level of control, security and flexibility to cloud-based application development and delivery with a single-tenant version of Bluemix, IBM's platform-as-a-service. The new platform enables developers to build ap...
|By Mark R. Hinkle||
|August 12, 2005 04:00 PM EDT||
Fedora Core (http://fedora.redhat.com) is one of the world's most popular Linux distributions in part from support by Red Hat and a strong community of users. It also has been a proving ground for Red Hat to develop technologies that will eventually make their way into Red Hat Enterprise Linux.
Recently Red Hat has spun off the Fedora Core Project into its own organization in much the same way that the Mozilla project was spun out of Netscape back in the late 1990s. Both Fedora and Red Hat Enterprise Linux have proven to be raging successes in their own right for both Red Hat and Linux users who choose to pursue a do-it-yourself approach to Linux. For those of you looking for additional resources to learn more about these distributions, you could consider the Red Hat Fedora and Enterprise Linux 4 Bible written by Christopher Negaus.
Christopher Negus has been working with UNIX systems, the Internet, and (most recently) Linux systems for more than two decades at AT&T Bell Laboratories, UNIX System Laboratories, and Novell, helping to develop the UNIX operating system. Features from many of the UNIX projects Chris worked on at AT&T have found their way into Red Hat Enterprise Linux, Fedora, and other Linux systems. Chris has written several books on UNIX and the Internet; his latest book is the Red Hat Fedora and Enterprise Linux 4 Bible (excerpted below) and released in July 2005. It discusses the features and capabilities of both operating systems. His book is written as a resource for users trying to adopt either of these technologies.
With your Fedora Core system connected to the Internet, you can take advantage of dozens of tools for browsing the Web, downloading files, getting e-mail, and communicating live with your friends. In most cases, you have several choices of GUI and command-line applications for using Internet services from your Linux desktop or shell. However, there are some utilities you may not be familiar with like wget, scp, and sftp.
Excerpt from Chapter 9...
Getting Files with wget
If you already know where a file is on the network, there are more efficient ways of downloading that file than opening an FTP session, moving around the FTP server, and running the get command. The wget command is a simple, efficient tool for doing non-interactive downloads of files over the Internet.
If there is a file you want to download from an FTP site or Web server (HTTP), and you know exactly where the file is, wget is a good way to download. The wget command is very useful if you want to copy a whole site, recursively, from one computer to another (for example, containing user home directories). When downloading from FTP sites, wget can let you just download as the anonymous user or add your own user name and password to the command line.
Downloading a File with User Name and Password
If you are doing an FTP file copy and need to log in as a user other than anonymous, you can add that information to the command line or to a .netrc file in your home directory (type man netrc to see the format of that file). Here is an example of adding the password to the command line:
CAUTION: Adding a password to a command line leaves the password exposed to onlookers. This practice is generally discouraged, except in cases where no one can see your monitor or your history files.
In the previous example, the user logs in as joe with the password my67chevy. The wget then copies the file memo1.doc from the current directory on the host computer named ftp.handsonhistory.com. That current directory is most likely /home/joe.
Downloading a Whole Web Site
Using wget, you can download a large number of files from Web servers as well. The wget command downloads files using the http protocol, if file addresses begin with http://. Downloading a single file, you would use the same form as you would for an FTP file (for example: wget http://host/file.). The best wget option for HTTP downloads is -r (recursive).
A recursive download lets you choose a point at a Web site and download all content below that point. Here is an example of a recursive download used to download the contents of the www.example.com Web site.
$ wget -r http://www.example.com
In this example, the HTML pages, images, and other content on the www.example.com Web site are copied below the current directory in the directory www.example.com. This is useful if you want to gather the contents of a Web site but don't have login access to that site. Because content is taken by following links, if there is content in a directory at the Web site that isn't in a link, it won't be downloaded.
Downloading an entire Web site can result in a massive amount of data being downloaded. If you want only part of a Web site, start from a point lower in the site's structure. Or, as an alternative, you can limit the number levels the wget will go down the site structure. Using the -l option (l as in level), the following example gets two levels of HTML content:
$ wget -r -l 2 http://www.example.com
To mirror a site, you can use the -m option instead of -r. With wget -m http://site, it is like asking to download an infinite number of levels recursively (-r -l inf), keep current time stamps (-N), and keep FTP directory listings (-nr).
Continuing a Download
In the old days, if you were downloading a particularly large file (such as an ISO image of a CD or DVD), if the download stopped for some reason (a disconnected network or errant reboot), you needed to start all over. With wget, you can choose to restart a download and have it continue right where it left off. This has been a lifesaver for me on many occasions.
Let's say that you were downloading a 4GB DVD ISO image named mydvd.iso from the site ftp://ftp.example.com and you killed the wget process by mistake after about 3GB of download. Make sure that your current directory is the one that contains the partially downloaded ISO. Then run the same wget command you did originally, adding the -c (continue) option as follows:
$ wget -c ftp://ftp.example.com/mydvd.iso
If you had not used the -c option, in this case, a new download would have started using the file name mydvd.iso.1 to download to.
NOTE: Another command that you might be interested in, similar to wget, is the curl command. Like wget, curl can download files using the ftp or http protocols. Curl can also do multiple file transfers on the same connection.
# ssh root@maple "tail -f /var/log/messages"
After you typed the password in the preceding case, the last several lines of the /var/log/messages file on the remote computer would be displayed. As messages were received, they would continue to be displayed until you decided to exit (press Ctrl+C to exit the tail command).
NOTE: Find out more about the ssh command from the SSH Web site (www.openssh.org).
Using scp for Remote File Copy
The scp command is a simple yet secure way of copying files among Linux systems. It uses the underlying ssh facility, so if ssh is enabled, so is scp. Here is an example of using scp to copy a file from one computer to another:
# scp myfile toys.linuxtoys.net:/home/chris
[email protected]'s password: ******
In this example, the file myfile is copied to the computer named toys.linuxtoys.net in the /home/chris directory. If you don't provide a user name (as is the case here), scp assumes you are using the current user name. Unlike some tools that provide remote login, scp and ssh do allow you to login as root user over the network, by default. (Many people turn off this feature for security reasons.)
To use scp with a different user name, you can append the user name with an @ character. For example, [email protected]:/home/chris would attempt to log in as the user named chris to do the file copy.
The first time you connect to a remote computer using scp or ssh, those commands try to establish the authenticity of the remote host. If it cannot establish the host's authenticity, it will display the RSA key fingerprint and ask you if you want to continue. If you type yes, scp will not question the authenticity of that computer again for subsequent scp commands.
However, if the RSA key fingerprint should change in the future for the remote computer (which will happen if, for example, the operating system is reinstalled on that computer), scp will refuse to let you connect to that remote computer. To override that refusal, you need to edit your $HOME/.ssh/known_hosts file and delete the entry for the remote computer. You can then verify the authenticity of the remote computer and continue to use scp.
The sftp command, which also communicates using secure ssh protocols, is a command for copying files from an FTP server. It is considered a more secure way of getting files from an FTP server that has an sshd server running.
You can receive more helpful tips on using Fedora and Red Hat Enterprise Linux 4 in Chris's book, Red Hat Fedora and Enterprise Linux 4 Bible available at your local retailer.
Nov. 20, 2014 05:45 PM EST Reads: 558
"There is a natural synchronization between the business models, the IoT is there to support ,” explained Brendan O'Brien, Co-founder and Chief Architect of Aria Systems, in this SYS-CON.tv interview at the 15th International Cloud Expo®, held Nov 4–6, 2014, at the Santa Clara Convention Center in Santa Clara, CA.
Nov. 20, 2014 05:30 PM EST Reads: 886
Focused on this fast-growing market’s needs, Vitesse Semiconductor Corporation (Nasdaq: VTSS), a leading provider of IC solutions to advance "Ethernet Everywhere" in Carrier, Enterprise and Internet of Things (IoT) networks, introduced its IStaX™ software (VSC6815SDK), a robust protocol stack to simplify deployment and management of Industrial-IoT network applications such as Industrial Ethernet switching, surveillance, video distribution, LCD signage, intelligent sensors, and metering equipment. Leveraging technologies proven in the Carrier and Enterprise markets, IStaX is designed to work ac...
Nov. 20, 2014 05:15 PM EST Reads: 694
C-Labs LLC, a leading provider of remote and mobile access for the Internet of Things (IoT), announced the appointment of John Traynor to the position of chief operating officer. Previously a strategic advisor to the firm, Mr. Traynor will now oversee sales, marketing, finance, and operations. Mr. Traynor is based out of the C-Labs office in Redmond, Washington. He reports to Chris Muench, Chief Executive Officer. Mr. Traynor brings valuable business leadership and technology industry expertise to C-Labs. With over 30 years' experience in the high-tech sector, John Traynor has held numerous...
Nov. 20, 2014 05:00 PM EST Reads: 767
Bit6 today issued a challenge to the technology community implementing Web Real Time Communication (WebRTC). To leap beyond WebRTC’s significant limitations and fully leverage its underlying value to accelerate innovation, application developers need to consider the entire communications ecosystem.
Nov. 20, 2014 04:45 PM EST Reads: 421
The 3rd International @ThingsExpo, co-located with the 16th International Cloud Expo - to be held June 9-11, 2015, at the Javits Center in New York City, NY - announces that it is now accepting Keynote Proposals. The Internet of Things (IoT) is the most profound change in personal and enterprise IT since the creation of the Worldwide Web more than 20 years ago. All major researchers estimate there will be tens of billions devices - computers, smartphones, tablets, and sensors - connected to the Internet by 2020. This number will continue to grow at a rapid pace for the next several decades.
Nov. 20, 2014 01:00 PM EST Reads: 1,246
The Internet of Things is not new. Historically, smart businesses have used its basic concept of leveraging data to drive better decision making and have capitalized on those insights to realize additional revenue opportunities. So, what has changed to make the Internet of Things one of the hottest topics in tech? In his session at @ThingsExpo, Chris Gray, Director, Embedded and Internet of Things, discussed the underlying factors that are driving the economics of intelligent systems. Discover how hardware commoditization, the ubiquitous nature of connectivity, and the emergence of Big Data a...
Nov. 20, 2014 12:30 PM EST Reads: 1,558
Almost everyone sees the potential of Internet of Things but how can businesses truly unlock that potential. The key will be in the ability to discover business insight in the midst of an ocean of Big Data generated from billions of embedded devices via Systems of Discover. Businesses will also need to ensure that they can sustain that insight by leveraging the cloud for global reach, scale and elasticity.
Nov. 18, 2014 09:00 PM EST Reads: 1,895
SYS-CON Events announced today that Windstream, a leading provider of advanced network and cloud communications, has been named “Silver Sponsor” of SYS-CON's 16th International Cloud Expo®, which will take place on June 9–11, 2015, at the Javits Center in New York, NY. Windstream (Nasdaq: WIN), a FORTUNE 500 and S&P 500 company, is a leading provider of advanced network communications, including cloud computing and managed services, to businesses nationwide. The company also offers broadband, phone and digital TV services to consumers primarily in rural areas.
Nov. 18, 2014 08:15 PM EST Reads: 1,355
SYS-CON Events announced today that IDenticard will exhibit at SYS-CON's 16th International Cloud Expo®, which will take place on June 9-11, 2015, at the Javits Center in New York City, NY. IDenticard™ is the security division of Brady Corp (NYSE: BRC), a $1.5 billion manufacturer of identification products. We have small-company values with the strength and stability of a major corporation. IDenticard offers local sales, support and service to our customers across the United States and Canada. Our partner network encompasses some 300 of the world's leading systems integrators and security s...
Nov. 18, 2014 08:15 PM EST Reads: 1,296
IoT is still a vague buzzword for many people. In his session at @ThingsExpo, Mike Kavis, Vice President & Principal Cloud Architect at Cloud Technology Partners, discussed the business value of IoT that goes far beyond the general public's perception that IoT is all about wearables and home consumer services. He also discussed how IoT is perceived by investors and how venture capitalist access this space. Other topics discussed were barriers to success, what is new, what is old, and what the future may hold. Mike Kavis is Vice President & Principal Cloud Architect at Cloud Technology Pa...
Nov. 18, 2014 01:30 PM EST Reads: 1,914
Smart devices that use wireless technology to exchange information with each other and with their human owners: this is the Internet of Things (IoT). This incredible level of connectivity is already transforming how we exercise, treat diseases, park our cars and access business documents. Research firm IDC projects that the IoT world of connected devices will grow to 200 billion objects by 2020. As more businesses, entrepreneurs and government entities embrace the IoT, more data will be generated daily than the already mind-boggling 2.5 quintillion bytes of data per day. However, even curren...
Nov. 15, 2014 02:00 PM EST Reads: 1,585
The Industrial Revolution in the 18th to 19th centuries was a period during which predominantly rural societies in Europe and America became industrial and urban. Advances in steam technology, transportation, mass production and the telegraph collectively transformed industry and society. Today, the Internet of Things (IoT) has the potential to once again transform industry and society just as the Industrial Revolution did. Analyst firm IDC forecasts that the IoT market will grow to $8.9 trillion by 2020 with anywhere between 30 to 50 billion connected autonomous things, making the potential g...
Nov. 15, 2014 12:00 PM EST Reads: 1,648
Cloud Expo 2014 TV commercials will feature @ThingsExpo, which was launched in June, 2014 at New York City's Javits Center as the largest 'Internet of Things' event in the world. The next @ThingsExpo will take place November 4-6, 2014, at the Santa Clara Convention Center, in Santa Clara, California. Since its launch in 2008, Cloud Expo TV commercials have been aired and CNBC, Fox News Network, and Bloomberg TV. Please enjoy our 2014 commercial.
Nov. 13, 2014 05:00 AM EST Reads: 3,485
From a software development perspective IoT is about programming "things," about connecting them with each other or integrating them with existing applications. In his session at @ThingsExpo, Yakov Fain, co-founder of Farata Systems and SuranceBay, will show you how small IoT-enabled devices from multiple manufacturers can be integrated into the workflow of an enterprise application. This is a practical demo of building a framework and components in HTML/Java/Mobile technologies to serve as a platform that can integrate new devices as they become available on the market.
Nov. 10, 2014 12:30 PM EST Reads: 2,587
The 3rd International Internet of @ThingsExpo, co-located with the 16th International Cloud Expo - to be held June 9-11, 2015, at the Javits Center in New York City, NY - announces that its Call for Papers is now open. The Internet of Things (IoT) is the biggest idea since the creation of the Worldwide Web more than 20 years ago.
Nov. 10, 2014 12:00 PM EST Reads: 5,892
Located in booth #314, the Bsquare team will present DataV demos and discuss how DataV will help customers put their data to work to improve business outcomes. DataV is unlocking new initiatives across a wide landscape of customers in industries such as industrial manufacturing, transportation, retail and mobile. The solution is designed to complement a new project start or help to enrich an existing machine investment.
Nov. 6, 2014 03:15 PM EST Reads: 2,321
The Physical Web incorporates beacons that can be put in any small retail store, for example, so that every store now has "an app" for its customers. In this Birds-of-a-Feather session at Internet of @ThingsExpo, Scott Jenson, Product Designer at Google, will discuss the Physical Web and how it is an open standard so any device can broadcast a URL wirelessly, so any phone/tablet/watch nearby can see, and rank those devices. When the user taps on one, they just go to that web page. It's really that simple. It's about thinking small, enabling micro-information (what is in my prescription bottle...
Nov. 3, 2014 05:00 PM EST Reads: 2,502
BSQUARE is a global leader of embedded software solutions. We enable smart connected systems at the device level and beyond that millions use every day and provide actionable data solutions for the growing Internet of Things (IoT) market. We empower our world-class customers with our products, services and solutions to achieve innovation and success. For more information, visit www.bsquare.com.
Nov. 3, 2014 03:00 PM EST Reads: 3,495
Whether you're a startup or a 100 year old enterprise, the Internet of Things offers a variety of new capabilities for your business. IoT style solutions can help you get closer your customers, launch new product lines and take over an industry. Some companies are dipping their toes in, but many have already taken the plunge, all while dramatic new capabilities continue to emerge. In his session at Internet of @ThingsExpo, Reid Carlberg, Senior Director, Developer Evangelism at salesforce.com, to discuss real-world use cases, patterns and opportunities you can harness today.
Nov. 3, 2014 02:30 PM EST Reads: 2,778