Information Security

For years, human-in-the-loop has provided the default reassurance when it comes to how artificial intelligence is governed. It sounds prudent. Responsible. Familiar. It is no longer true. Weve ente… [+8873 chars]

Brightspeed, one of the largest fiber broadband providers in the United States, is investigating claims that hackers stole sensitive data tied to more than one million customers. The allegations sur… [+9918 chars]

Starting January 28, 2026, Google Play will stop allowing downloads and updates of overseas crypto exchange and wallet apps in South Korea unless those platforms prove they are registered with the co… [+2368 chars]

The Canadian Investment Regulatory Organization (CIRO) confirmed that the data breach it suffered last year impacts about 750,000 Canadian investors. The organization disclosed the incident on Augus… [+2316 chars]

NEW YORK, Jan. 18, 2026 (GLOBE NEWSWIRE) -- WHY: Rosen Law Firm, a global investor rights law firm, reminds purchasers of securities of Coupang, Inc. (NYSE: CPNG) between August 6, 2025 and Decembe… [+4001 chars]

Heres an overview of some of last weeks most interesting news, articles, interviews and videos: What security teams can learn from torrent metadataSecurity teams often spend time sorting through log… [+17189 chars]

Ransomware is a type of malicious software that makes a victim’s data, system or device inaccessible. It locks the target or encrypts it (converting text into an unreadable form) until the victim pay… [+6661 chars]

<h2>Introduction to the C Shell Legacy</h2><p>Ever wonder why some terminal commands feel like you're writing actual code? Back in the late 70s, Bill Joy was at UC Berkeley and decided the standard shell just didn't cut it for programmers, so he built csh. (<a href="https://programminglanguages.info/language/c-shell/">C shell Programming Language Information &amp; Resources</a>)</p><p>The C Shell was basically a love letter to the C programming language. Joy wanted a tool that felt familiar to developers working on the BSD operating system. It wasn't just about running files; it was about bringing logic to the command line.</p><ul> <li><strong>C-like Syntax</strong>: It uses if-then-else structures that look just like C code, which made it a hit in academic and engineering circles.</li> <li><strong>Interactive Features</strong>: This was the first shell to give us things we take for granted now, like command history and aliasing. (<a href="https://www.reddit.com/r/pcgaming/comments/zskd2k/what_was_the_first_rtsstrategy_game_you_played/">What was the first RTS/strategy game you played? – Reddit</a>)</li> <li><strong>BSD Roots</strong>: It became the default for many early Unix systems, especially in research labs and early engineering setups. (<a href="https://en.wikipedia.org/wiki/Unix">Unix – Wikipedia</a>)</li> </ul><p><img decoding="async" src="https://cdn.pseo.one/685c40ed27f41983fb07307c/686ef593027b1d23f092b31c/c-shell-demo-and-features/mermaid-diagram-1.svg" alt="Diagram 1"></p><p>According to the <a href="https://www.freebsd.org/cgi/man.cgi?query=csh">The FreeBSD Project</a>, csh remains a core part of the system heritage because of its unique job control features. Even if bash is more popular now, csh paved the way for how we interact with machines today.</p><p>Next, let's look at the specific interactive features that made it famous.</p><h2>Core Features that Defined an Era</h2><p>If you’ve ever felt like your terminal was reading your mind after you typed a single character, you probably have the C Shell to thank. It’s the grandparent of the "quality of life" features we all use today without thinking twice.</p><p>The big game changer was the <strong>history substitution</strong>. Before this, if you made a typo in a long string, you basically had to type the whole thing again like a caveman. With csh, you just used the "bang" (!) operator.</p><ul> <li><strong>The ! Operator</strong>: Typing <code>!!</code> runs the last command, while <code>!$</code> grabs the last argument. It's a lifesaver in high-pressure environments like scientific research labs where speed matters.</li> <li><strong>Aliasing</strong>: You could finally turn <code>ls -laF | more</code> into just <code>ll</code>. It helped engineers manage complex directory structures way faster.</li> <li><strong>Job Control</strong>: Csh let you suspend a process with <code>Ctrl+Z</code> and shove it into the background.</li> </ul><p>Since it was built to look like C code, it felt super natural for engineers. But, honestly, it has some quirks that drive people crazy.</p><p><img decoding="async" src="https://cdn.pseo.one/685c40ed27f41983fb07307c/686ef593027b1d23f092b31c/c-shell-demo-and-features/mermaid-diagram-2.svg" alt="Diagram 2"></p><p>The use of the <code>@</code> symbol for math and the <code>if-then-else</code> blocks made it feel like "real" programming. </p><blockquote> <p>A classic "Csh Programming Considered Harmful" essay from 1990 points out that while it's great for typing, the way it handles piping and errors makes it risky for complex automation. Specifically, you can't redirect stdout and stderr separately—which is a total nightmare—and it has weird issues with word splitting that breaks scripts if your variables has spaces in them.</p> </blockquote><p>Even with those flaws, it’s still cool to see how it shaped modern dev tools. Next up, we’ll dive into how it handles variables and pathing.</p><h2>Live Demo: Setting Up Your Environment</h2><p>Ready to actually get your hands dirty? Setting up a csh environment feels a bit like tuning a vintage car—it’s got personality, and if you don't treat the config files right, it might just stall on you.</p><p>The <code>.cshrc</code> file is where the magic happens. Unlike modern shells that use a million different files, csh mostly looks here every time a new shell starts. You’ll want to set your path and some basic variables first so you aren't constantly typing full directory strings.</p><ul> <li><strong>Pathing</strong>: Use <code>set path = ( /usr/bin /bin /usr/local/bin . )</code>. Don't forget that dot at the end if you want to run scripts in your current folder, though some security folks hate that.</li> <li><strong>The Prompt</strong>: A boring prompt is a buzzkill. Try <code>set prompt = "%n@%m: %~ %# "</code> to see your username and machine name. It helps a ton when you're jumping between servers in a big research facility or a data center.</li> <li><strong>Validation</strong>: If you're doing heavy api development, you might use tools from <a href="https://www.compile7.org/">Compile7</a> to make sure your environment variables actually align with your build tools. It’s better than guessing why your compiler is screaming.</li> </ul><p>Writing a script in csh is weirdly satisfying because of that C-style syntax. Let’s say you’re in a lab and need to batch rename some old data logs.</p><pre><code class="language-csh">#!/bin/csh foreach file (*.log) echo "Processing $file" mv $file $file.bak end </code></pre><p>It’s pretty straightforward, but watch out for the spaces. Csh is picky about where you put your parentheses. If you need user input, the <code>$&lt;</code> symbol is your best friend for grabbing a string from the terminal. For example, you can do:</p><pre><code class="language-csh">echo "Enter your name:" set user_name = $&lt; echo "Hello $user_name" </code></pre><p><img decoding="async" src="https://cdn.pseo.one/685c40ed27f41983fb07307c/686ef593027b1d23f092b31c/c-shell-demo-and-features/mermaid-diagram-3.svg" alt="Diagram 3"></p><p>Honestly, the error handling is a bit clunky compared to bash, but for quick interactive work, it’s still snappy. Next, we’re gonna wrap things up by comparing csh to the modern shells we use today.</p><h2>Comparing csh with Modern Shells</h2><p>So, is csh actually better than bash? Honestly, it depends on if you're typing or scripting. While bash and zsh won the popularity contest for automation, csh still has its fans in legacy systems.</p><ul> <li><strong>tcsh is the real hero</strong>: Most people using csh today are actually using <strong>tcsh</strong>, which fixed the worst bugs and added better tab completion.</li> <li><strong>Interactive speed</strong>: For quick terminal work in engineering or research, those C-style shortcuts still feel snappy. </li> <li><strong>Scripting headaches</strong>: Most modern devops pipelines avoid csh because it handles standard error and piping in a way that makes "real" scripting a nightmare.</li> </ul><p><img decoding="async" src="https://cdn.pseo.one/685c40ed27f41983fb07307c/686ef593027b1d23f092b31c/c-shell-demo-and-features/mermaid-diagram-4.svg" alt="Diagram 4"></p><p>I've seen engineers in research labs stick to it just because their brain is wired for C. It's a bit like driving a manual car—more work, but you feel the gears. If you're doing modern api work, stick to zsh, but knowing csh makes you look like a wizard when touching old bsd servers.</p><p>The 1990 essay mentioned earlier actually listed several reasons why csh is a pain for scripts, including:</p><ol> <li>Ad-hoc parsing that leads to unpredictable behavior.</li> <li>Poor signal handling.</li> <li>No way to reliably check if a variable exists without the script crashing.</li> <li>Limited file descriptors.</li> <li>Quoting hell.</li> </ol><div class="spu-placeholder" style="display:none"></div><div class="addtoany_share_save_container addtoany_content addtoany_content_bottom"><div class="a2a_kit a2a_kit_size_20 addtoany_list" data-a2a-url="https://securityboulevard.com/2026/01/oauth2-identity-provider-setup-complete-implementation-guide/" data-a2a-title="OAuth2 Identity Provider Setup: Complete Implementation Guide"><a class="a2a_button_twitter" href="https://www.addtoany.com/add_to/twitter?linkurl=https%3A%2F%2Fsecurityboulevard.com%2F2026%2F01%2Foauth2-identity-provider-setup-complete-implementation-guide%2F&amp;linkname=OAuth2%20Identity%20Provider%20Setup%3A%20Complete%20Implementation%20Guide" title="Twitter" rel="nofollow noopener" target="_blank"></a><a class="a2a_button_linkedin" href="https://www.addtoany.com/add_to/linkedin?linkurl=https%3A%2F%2Fsecurityboulevard.com%2F2026%2F01%2Foauth2-identity-provider-setup-complete-implementation-guide%2F&amp;linkname=OAuth2%20Identity%20Provider%20Setup%3A%20Complete%20Implementation%20Guide" title="LinkedIn" rel="nofollow noopener" target="_blank"></a><a class="a2a_button_facebook" href="https://www.addtoany.com/add_to/facebook?linkurl=https%3A%2F%2Fsecurityboulevard.com%2F2026%2F01%2Foauth2-identity-provider-setup-complete-implementation-guide%2F&amp;linkname=OAuth2%20Identity%20Provider%20Setup%3A%20Complete%20Implementation%20Guide" title="Facebook" rel="nofollow noopener" target="_blank"></a><a class="a2a_button_reddit" href="https://www.addtoany.com/add_to/reddit?linkurl=https%3A%2F%2Fsecurityboulevard.com%2F2026%2F01%2Foauth2-identity-provider-setup-complete-implementation-guide%2F&amp;linkname=OAuth2%20Identity%20Provider%20Setup%3A%20Complete%20Implementation%20Guide" title="Reddit" rel="nofollow noopener" target="_blank"></a><a class="a2a_button_email" href="https://www.addtoany.com/add_to/email?linkurl=https%3A%2F%2Fsecurityboulevard.com%2F2026%2F01%2Foauth2-identity-provider-setup-complete-implementation-guide%2F&amp;linkname=OAuth2%20Identity%20Provider%20Setup%3A%20Complete%20Implementation%20Guide" title="Email" rel="nofollow noopener" target="_blank"></a><a class="a2a_dd addtoany_share_save addtoany_share" href="https://www.addtoany.com/share"></a></div></div><p class="syndicated-attribution">*** This is a Security Bloggers Network syndicated blog from <a href="https://ssojet.com/blog">SSOJet - Enterprise SSO &amp;amp; Identity Solutions</a> authored by <a href="https://securityboulevard.com/author/0/" title="Read other posts by SSOJet - Enterprise SSO &amp; Identity Solutions">SSOJet - Enterprise SSO &amp; Identity Solutions</a>. Read the original post at: <a href="https://ssojet.com/blog/oauth2-identity-provider-setup-complete-implementation-guide">https://ssojet.com/blog/oauth2-identity-provider-setup-complete-implementation-guide</a> </p>

On January 5, Health Minister Simeon Brown ordered the Ministry of Health to begin a review of the ManageMyHealth cyberbreach by January 30, covering the causes, the adequacy of protections and recom… [+9169 chars]

A $10 million class action settlement is on the table after one of the biggest student loan servicing pipelines in the United States suffered a data security incident. The case stems from an August … [+1436 chars]

The BBC has published a podcast series on Aleksanteri Kivimäki, who was convicted in connection with the Vastaamo hack. The six-part series delves into Kivimäki's story and the experiences of the vi… [+1040 chars]

A Department of Homeland Security whistleblower has released the identities of about 4,500 ICE and Border Patrol employees Tuesday in what has been called potentially the largest agency data breach f… [+1312 chars]

NEW RESOURCES GPO: GPO And The Library Of Congress Digitize 10,000 Volumes Of The United States Serial Set. “U.S. Government Publishing Office (GPO) achieved a major milestone by uploading and maki… [+5011 chars]

JPMorgan Chase says a data breach has exposed customers’ sensitive personal and financial information. In a filing with the Office of the Maine Attorney General, JPMorgan Chase says cybercriminals h… [+1492 chars]

<ul><li>AWS announces the general availability of the AWS European Sovereign Cloud and plans to expand across Europe with new AWS Local Zones in Belgium, the Netherlands, and Portugal</li></ul>Potsda… [+25004 chars]

Eight years ago, Hong Kongs flag carrier airline was facing a branding crisis. Its marketing team was equally misunderstood and undervalued. Today, its CEO regularly serves drinks to customers at his… [+7686 chars]

A soon as Meri-Tuuli Auer saw the subject line in her junk folder, she knew it was no ordinary spam email. It contained her full name and her social security number - the unique code Finnish people u… [+7802 chars]

Claim: A January 2026 Department of Homeland Security data leak revealed Enrique Tarrio, the former Proud Boys leader, was an Immigration and Customs Enforcement agent. In January 2026, after a rep… [+6720 chars]

PITTSBURGH, Jan. 16, 2026 (GLOBE NEWSWIRE) -- Mid Michigan Medical Billing Service, Inc. (MMMBS),1 recently announced a cybersecurity incident, which impacted the personal information of a nearly thi… [+1670 chars]

The spirits industry has faced economic issues since the end of the Covid-19 pandemic that continue to mount. Among the reasons given for financial distress are the lasting effects from the Covid-19… [+5176 chars]

<ul><li>CISPA researchers uncover AMD CPU flaw “StackWarp” breaking confidential VM protections</li><li>Vulnerability enables RCE, privilege escalation, and theft of private keys in Zen processors</l… [+2661 chars]

For businesses, post-quantum cryptography (PQC) is more than a technical upgrade -- it's necessary to protect digital interactions. Organizations are under heavy pressure to begin migrating to quantu… [+10507 chars]

Data breach at Canadas Investment Watchdog Canadian Investment Regulatory Organization impacts 750,000 people The Canadian Investment Regulatory Organization (CIRO) is Canadas national self-regulato… [+2556 chars]

Google parent company Alphabet hit the $4 trillion mark this week, second only to Nvidia in market capitalization, and no wonder. It kept showing off its newfound AI prowess, as Apple will use Gemin… [+12386 chars]

A new year means new threats to your data, privacy, and money (not to mention the old ones that you still have to keep an eye out for). Thankfully, improving your security doesnt have to be difficult… [+6016 chars]