There are a lot more ways to check files using if commands than many of us realize. Although this information is included in the bash man page, that man page has thousands of lines and you could easily find yourself paging down more than 100 times to reach it.This post, provides information on each option and examples for some of the most useful ones.
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Checking if a file exists
One of the most commonly used tests for checking on files is if [ -f filename ]. This test will result in true if the file exists and is a regular file—not a directory or a symbolic link. You might use it like this:To read this article in full, please click here
There are a lot more ways to check files using if commands than many of us realize. Although this information is included in the bash man page, that man page has thousands of lines and you could easily find yourself paging down more than 100 times to reach it.This post, provides information on each option and examples for some of the most useful ones.
[ Get regularly scheduled insights by signing up for Network World newsletters. ]
Checking if a file exists
One of the most commonly used tests for checking on files is if [ -f filename ]. This test will result in true if the file exists and is a regular file—not a directory or a symbolic link. You might use it like this:To read this article in full, please click here
If you purchase a server in the next few months featuring Intel’s Sapphire Rapids generation of Xeon Scalable processor or AMD’s Genoa generation of Epyc processors, they will come with a notable new function called Compute Express Link (CXL)—an open interconnect standard you may find useful, especially in future iterations.CXL is supported by pretty much every hardware vendor and built on top of PCI Express for coherent memory access between a CPU and a device, such as a hardware accelerator, or a CPU and memory.PCIe is meant for point-to-point communications such as SSD to memory, but CXL will eventually support one-to-many communication by transmitting over coherent protocols. So far, CXL is capable of simple point-to-point communication only.To read this article in full, please click here
If you purchase a server in the next few months featuring Intel’s Sapphire Rapids generation of Xeon Scalable processor or AMD’s Genoa generation of Epyc processors, they will come with a notable new function called Compute Express Link (CXL)—an open interconnect standard you may find useful, especially in future iterations.CXL is supported by pretty much every hardware vendor and built on top of PCI Express for coherent memory access between a CPU and a device, such as a hardware accelerator, or a CPU and memory.PCIe is meant for point-to-point communications such as SSD to memory, but CXL will eventually support one-to-many communication by transmitting over coherent protocols. So far, CXL is capable of simple point-to-point communication only.To read this article in full, please click here
By: Derek Granath, Senior Director, SD-WAN Product and Technical Marketing at Aruba, a Hewlett Packard Enterprise company.A Quick History LessonBelieve it or not, the term Software-defined Wide Area Network (SD-WAN) was first introduced back in 2014, practically ancient history when it comes to networking at the edge. It’s now well recognized and increasingly adopted as the cloud-first way to transform WAN architecture, improving application performance, enabling more efficient connectivity, and reducing network complexity.Secure Access Service Edge, known as SASE, describes the cloud-first architecture for both WAN and security functions, all delivered and managed in the cloud. In short, SASE is a blend of SD-WAN and cloud-delivered security.To read this article in full, please click here
The enterprise network is undergoing a fundamental transition from manual to automated, from hardware to software-defined, from tightly controlled to sprawling across SaaS, multi-cloud, remote work and IoT environments.Network professionals are expected to not only extend existing functionality across all of those environments, they must elevate the capabilities of the network to enable digital transformation. That means building a network that’s more agile, resilient, secure, scalable, observable and intelligent.To read this article in full, please click here
The cd command makes it easy to switch to another directory on Liniux, but only if you know where you’re heading. In this post, I discuss a couple of tricks for moving between known locations and provide a script for finding and “remembering” files or locations that you might want to reuse.One of the easiest things to do with the cd command is return to your home directory regardless of where you are sitting in the file system at the moment. Just type cd by itself, and you’ll be back in your home directory. Typing cd ~ will do the same thing, though adding the tilde won’t get you there any faster.To read this article in full, please click here
Like many of its competitors, Cisco’s quarterly and year-end financial results show the good and bad of the current economy—a record of new product orders alongside record backlogged orders.Cisco reported that for the period ending July 30, its quarterly revenue was basically flat year-over-year at $13.1 billion, but revenue for the 2022 fiscal year was up three percent to $51.6 billion.
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“Full year product orders and backlog are both at record highs,” Cisco’s CEO Chuck Robbins said in a written statement before the company’s quarterly and year-end Wall Street phone briefing.To read this article in full, please click here
Redundancy is essential for dealing with both planned and unplanned outages, and that includes having redundant dynamic host-configuration protocol (DHCP) servers to allow uninterrupted dynamic assignment of IP addresses.For those working in Windows environments, there are currently two options for setting up redundant DHCP servers: a failover scenario with a main server paired with another in hot standby; and a load-balancing scenario in which two DHCP servers actively handle client requests.
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Tool sprawl is a daunting problem that plagues enterprise IT everywhere you look, from data center operations to cybersecurity to network reliability to application performance.Tool sprawl occurs when organizations acquire licenses (or not, in the case of open source) for multiple tools that tackle related, but not completely overlapping, issues. Layered security is the most obvious example of this, but the problem bedevils networking, DevOps, cloud teams, etc.To read this article in full, please click here
Growth in hyperscaler data centers and processor-intensive enterprise workloads, such as high-performance computing (HPC) and AI, is set to drive broadscale adoption of smartNICs.The Ethernet controller and adapter market will grow from $3.2 billion in 2021 to $5 billion in 2026, with smartNICs contributing significantly to the growth, according to Dell’Oro Group. In addition, server network connectivity will transition to higher speeds, according to the research firm, which predicts 100 Gbps and higher-speed ports will account for 44% of the shipments in five years.To read this article in full, please click here
Watch is a command on Linux that will repeatedly run commands for you, and it offers some very useful options. One of its basic options is that you can tell watch how long to wait before running the specified command again. For example, if you run the command watch -n 10 date, the watch command will first clear the screen and run the date command right away. After that, it will run the command every 10 seconds until you stop it by hitting control-C. Note that the first line on the screen will indicate the wait time between iterations (every 10 seconds).$ watch -n 10 date
Every 10.0s: date fedora: Fri, Aug 12 16:32:09 EDT 2022
Fri Aug 12 04:10:11 PM EDT 2022
The -n option specifies the number of seconds between commands. The default is 2. You might have to look closely to notice the changes in the output.To read this article in full, please click here
AWS says its private 5G managed service is now available – however, it currently only supports 4G LTE and doesn’t yet support 5G.With AWS Private 5G, which was previewed last November, customers will be able to specify where they want to build a mobile network and its capacity, and AWS will deliver and maintain the small-cell radio units, servers, 5G-core and RAN software, and SIM cards. The idea is to let enterprises quickly procure, deploy, and scale their own private 5G mobile networks without having to acquire, integrate, and maintain hardware and software from multiple third-party vendors.To read this article in full, please click here
As large enterprises spread by deploying distributed data centers and on-prem or public-cloud services, their ability to control and manage applications and workloads utilizing that infrastructure is becoming more difficult.An emerging technology called multi-cloud networking software (MCNS) is coming together from a variety of vendors—Cisco, Arista, VMware, and F5 among them—to address many of these challenges.
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In a recent report Gartner said MCNS technology enables consistent networking policy, network security, governance, and network visibility across multiple cloud environments via a single point of management.To read this article in full, please click here
Subsidies and investment for US silicon manufacturing will mean jobs and a lessened dependence on East Asia for badly needed semiconductors, according to the Biden administration.
Enterprises have options for making cloud services more resilient but at a price premium of up to 111% over the base price of services that offer no protection, according to a study by Uptime Institute.The extra cost can mean faster recovery times, better compensation from service-level agreements when there are outages, and improved “implied reliability,” according to Uptime’s report “Public cloud costs versus resiliency: stateless applications”.
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The institute modeled three scenarios for improving the resiliency of a simple WordPress website that was, at peak, required to deliver webpages within three seconds of requests. The researchers generated a Python simulation that varied bandwidth and virtual-machine demands to analyze their effects on costs.To read this article in full, please click here
Private 5G is technology that can be used in local area networks. Not to be confused with the public 5G connectivity offered by telephone companies, private 5G is used in corporate campuses, office buildings, factories and warehouses, event venues, and airports, either instead of or in addition to Wi-Fi.According to an unpublished survey from research firm Forrester, 44% of corporate telecommunications decision-makers plan to create private 5G networks. Industries with significant private 5G plans include water and waste, high-tech manufacturing, and retail and wholesale. Other areas where private 5G might crop up include stadiums and construction sites, says Forrester analyst Andre Kindness. "They're prime for 5G technologies."To read this article in full, please click here
The appeal of private 5G is driving companies to explore ways to improve the performance, scalability and flexibility of their mobile networks.Enterprise deployment of the technology has been slow due to the pandemic and an immature device ecosystem, but that's not stopping early adopters. To help get started, they're turning to service providers, which can include telcos, private wireless vendors, hardware vendors, systems integrators, and major cloud players.To read this article in full, please click here
Semiconductor maker Semtech has announced plans to acquire fellow chip vendor Sierra Wireless in an effort to accelerate its push into making internet of things components.Semtech makes a variety of analog and mixed-signal chips, including long-range, low-power wireless RF connectivity, power management, and video-broadcast equipment. Sierra Wireless makes dedicated IoT technology. Semtech has made steps toward this market but a takeover of Sierra would accelerate the effort.
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