# Applications

**URL:** https://community.unix.com/c/applications/60.md

[Latest](https://community.unix.com/latest.md) · [Categories](https://community.unix.com/categories.md)

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## [About the Applications category](https://community.unix.com/t/about-the-applications-category/138099)

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**Author:** [@system](https://community.unix.com/u/system)\
**Replies:** 0

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Unix and Linux Applications.

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## [etcsh: an enhanced version of tcsh](https://community.unix.com/t/etcsh-an-enhanced-version-of-tcsh/397532)

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**Author:** [@MProG10](https://community.unix.com/u/MProG10)\
**Replies:** 1\
**Last updated:** [September 10, 2026, 8:05pm UTC](https://community.unix.com/t/etcsh-an-enhanced-version-of-tcsh/397532 "2026-09-10T20:05:06Z")

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Hello. I'm writing this post as a matter of contribution. I forked tcsh, and added some features. New features include • function declarations; • variable assignment from pipes and redirections; • comments on interact…

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## [ VX6 - IPv6 based peer2peer mesh network for secure hosting. ](https://community.unix.com/t/vx6-ipv6-based-peer2peer-mesh-network-for-secure-hosting/397492)

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**Author:** [@ethical-buddy](https://community.unix.com/u/ethical-buddy)\
**Replies:** 0\
**Last updated:** [April 27, 2026, 9:00am UTC](https://community.unix.com/t/vx6-ipv6-based-peer2peer-mesh-network-for-secure-hosting/397492 "2026-04-27T09:00:49Z")

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Just get open-sourced VX6 - allows you to connect your localhost to any other persons localhost on different ports from anywhere in the world without hosting or static IP and no hassel of NAT. No IP or port forwarding …

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## [SELinux Basic concepts](https://community.unix.com/t/selinux-basic-concepts/397490)

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**Author:** [@dextergenious](https://community.unix.com/u/dextergenious)\
**Replies:** 0\
**Last updated:** [April 24, 2026, 5:15am UTC](https://community.unix.com/t/selinux-basic-concepts/397490 "2026-04-24T05:15:47Z")

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I was going through this page and got a basic question from the link OP has shared, if somebody can help. Creating custom SELinux policy .te file and others are generated after sepolicy command was used. But before …

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## [N-Queens Solver with Optimizations (GitHub, Ruby, Ruby Gem)](https://community.unix.com/t/n-queens-solver-with-optimizations-github-ruby-ruby-gem/395488)

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**Author:** [@Neo](https://community.unix.com/u/Neo)\
**Replies:** 36\
**Last updated:** [April 23, 2026, 2:37pm UTC](https://community.unix.com/t/n-queens-solver-with-optimizations-github-ruby-ruby-gem/395488 "2026-04-23T14:37:28Z")

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N-Queens Solver This project provides a flexible, efficient, and dynamically optimized solution to the N-Queens problem. It includes multiple solving methods, each tailored for different board sizes, ensuring the best pe…

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## [Fits\_parser v0.1.0 - a lightweight ruby gem for astrophysics researchers](https://community.unix.com/t/fits-parser-v0-1-0-a-lightweight-ruby-gem-for-astrophysics-researchers/397471)

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**Author:** [@Neo](https://community.unix.com/u/Neo)\
**Replies:** 0\
**Last updated:** [April 1, 2026, 3:41am UTC](https://community.unix.com/t/fits-parser-v0-1-0-a-lightweight-ruby-gem-for-astrophysics-researchers/397471 "2026-04-01T03:41:55Z")

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Just released this Ruby Gem for astrophysics researchers: README.md fits\_parser A minimal Ruby gem to parse astronomy FITS files (.fit / .fits). Citation If you use fits\_parser in research or publications, cite: B…

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## [StellarPop v0.3.1 — Ruby on Rails Stellar Population Synthesis Pipeline](https://community.unix.com/t/stellarpop-v0-3-1-ruby-on-rails-stellar-population-synthesis-pipeline/397470)

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**Author:** [@Neo](https://community.unix.com/u/Neo)\
**Replies:** 1\
**Last updated:** [March 30, 2026, 1:15pm UTC](https://community.unix.com/t/stellarpop-v0-3-1-ruby-on-rails-stellar-population-synthesis-pipeline/397470 "2026-03-30T13:15:14Z")

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I've been building StellarPop, an open source stellar population synthesis (SPS) fitting pipeline written in Ruby on Rails. v0.3.1 is now live on Zenodo. My first job out of the university was at JHU APL working on bot…

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## [SELinux/MAC and DAC Permissions](https://community.unix.com/t/selinux-mac-and-dac-permissions/397469)

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**Author:** [@dextergenious](https://community.unix.com/u/dextergenious)\
**Replies:** 6\
**Last updated:** [March 26, 2026, 6:57am UTC](https://community.unix.com/t/selinux-mac-and-dac-permissions/397469 "2026-03-26T06:57:41Z")

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I am putting it in 2 points : SELinux rules apply after DAC permissions. Example quote from RH documentation says a Rule permits httpd process to access related web directories and files (/var/www/html & others)…

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## [SysAdmin x DevOps project ideas for 2026 on-premises setup?](https://community.unix.com/t/sysadmin-x-devops-project-ideas-for-2026-on-premises-setup/397421)

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**Author:** [@Ihattaren](https://community.unix.com/u/Ihattaren)\
**Replies:** 1\
**Last updated:** [January 27, 2026, 2:18pm UTC](https://community.unix.com/t/sysadmin-x-devops-project-ideas-for-2026-on-premises-setup/397421 "2026-01-27T14:18:28Z")

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This is what chatgpt gave to me. :hammer\_and\_wrench: Project 1 — Production Linux Server Setup Goal: Turn a fresh Linux VM into a production-ready server Do this: Create a non-root sudo user Disable password SSH,…

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## [Postmortem: Russian Botnet DDoS and the Ubuntu 18 Collapse](https://community.unix.com/t/postmortem-russian-botnet-ddos-and-the-ubuntu-18-collapse/397382)

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**Author:** [@Neo](https://community.unix.com/u/Neo)\
**Replies:** 1\
**Last updated:** [December 7, 2025, 7:08am UTC](https://community.unix.com/t/postmortem-russian-botnet-ddos-and-the-ubuntu-18-collapse/397382 "2025-12-07T07:08:28Z")

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Over two weeks ago this site experienced a severe and prolonged slowdown on the legacy Ubuntu 18 server that hosted both the Discourse community.unix.com forum and the Rails man-pages application. The system became pract…

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## [Rails Console Script - Watch memcache status for Rails App](https://community.unix.com/t/rails-console-script-watch-memcache-status-for-rails-app/397381)

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**Author:** [@Neo](https://community.unix.com/u/Neo)\
**Replies:** 5\
**Last updated:** [December 7, 2025, 7:07am UTC](https://community.unix.com/t/rails-console-script-watch-memcache-status-for-rails-app/397381 "2025-12-07T07:07:35Z")

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Here is a simple script I use to watch the memcached status for a Rails app (the unix.com man-pages Rails app), from the Rails console: Rails console: irb(main):019\* loop do irb(main):020\* s = Rails.cache.stats.values…

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## [browser for power-users](https://community.unix.com/t/browser-for-power-users/397377)

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**Author:** [@j0il1u](https://community.unix.com/u/j0il1u)\
**Replies:** 1\
**Last updated:** [November 28, 2025, 9:35pm UTC](https://community.unix.com/t/browser-for-power-users/397377 "2025-11-28T21:35:53Z")

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I am looking for a browser for power usage, with below conditions. support crx entensions abilitiy to turn off all security related restrictions and web security, e.x: CORS, unsafe-origin, HSTS, etc. ability to edit al…

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## [Gnome shell problem on debian 13](https://community.unix.com/t/gnome-shell-problem-on-debian-13/397218)

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**Author:** [@Matthew](https://community.unix.com/u/Matthew)\
**Replies:** 1\
**Last updated:** [August 13, 2025, 1:39pm UTC](https://community.unix.com/t/gnome-shell-problem-on-debian-13/397218 "2025-08-13T13:39:51Z")

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Today i just boot my Debian 13 and gnome was using some slightly corrupted custom theme..I tried to reinstall gnome shell, basically everything what popped on my mind..but nothing..even GDM has custom theme..i really don…

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## [HTTP/1.1 500 Internal Server Error using curl command](https://community.unix.com/t/http-1-1-500-internal-server-error-using-curl-command/397187)

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**Author:** [@alexcol](https://community.unix.com/u/alexcol)\
**Replies:** 6\
**Last updated:** [August 9, 2025, 1:12am UTC](https://community.unix.com/t/http-1-1-500-internal-server-error-using-curl-command/397187 "2025-08-09T01:12:53Z")

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Good evening, Im just starting to learn curl to exceute xml commands, in a Telco a run this command to validate the login to a network element and then execute other commands: $ curl -v -X POST http://10.74.13.124:8001 …

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## [java.net.SocketTimeOutException: Read TimeOut](https://community.unix.com/t/java-net-sockettimeoutexception-read-timeout/397135)

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**Author:** [@alexcol](https://community.unix.com/u/alexcol)\
**Replies:** 1\
**Last updated:** [July 14, 2025, 6:48am UTC](https://community.unix.com/t/java-net-sockettimeoutexception-read-timeout/397135 "2025-07-14T06:48:38Z")

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Good Evening: In a Telco Web application which consist of package sales there are various systems involved for example connected to a Online charge System OCS to create recharges using tuxedos in OCS, then connect to …

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## [Contact Form not displaying as it should](https://community.unix.com/t/contact-form-not-displaying-as-it-should/396749)

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**Author:** [@ignatius](https://community.unix.com/u/ignatius)\
**Replies:** 2\
**Last updated:** [March 27, 2025, 6:34pm UTC](https://community.unix.com/t/contact-form-not-displaying-as-it-should/396749 "2025-03-27T18:34:11Z")

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First of all, kudos on the new web design. Looks good. I have some HTML that i'm trying to incorporate into my web site. It works well. The problem is that I cannot "move" around the web site with the mouse as I once c…

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## [Fail2ban with iptables](https://community.unix.com/t/fail2ban-with-iptables/382587)

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**Author:** [@bucminhdo](https://community.unix.com/u/bucminhdo)\
**Replies:** 7\
**Last updated:** [March 26, 2025, 5:04am UTC](https://community.unix.com/t/fail2ban-with-iptables/382587 "2025-03-26T05:04:48Z")

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Hi guys, I am using CentOS 8 and use iptables as a main firewall I've just installed fail2ban and configured "/etc/fail2ba/jail.local" as below \[sshd\] enabled = true action = iptables\[name=SSH, port=ssh, protocol=tcp\]…

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## [Progress: Squashing and Redirecting Rouge Bots](https://community.unix.com/t/progress-squashing-and-redirecting-rouge-bots/396753)

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**Author:** [@Neo](https://community.unix.com/u/Neo)\
**Replies:** 0\
**Last updated:** [March 25, 2025, 10:28am UTC](https://community.unix.com/t/progress-squashing-and-redirecting-rouge-bots/396753 "2025-03-25T10:28:05Z")

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Well, Hell Yes! :fire: Just a few weeks ago, this Discourse site was getting slammed with around 4 million rogue bot hits per day: Now we’re down to about 10% of that—hovering in the 300K range daily: I wrote a …

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## [MP4 displayed on a web site](https://community.unix.com/t/mp4-displayed-on-a-web-site/396669)

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**Author:** [@ignatius](https://community.unix.com/u/ignatius)\
**Replies:** 2\
**Last updated:** [March 10, 2025, 1:43am UTC](https://community.unix.com/t/mp4-displayed-on-a-web-site/396669 "2025-03-10T01:43:35Z")

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Hi. I have a unique problem. I'm trying to display an MP4 on the background of my website. And I would like to have a telnet client that displays over it. I can load the MP4, and it plays, as expected. The problem is th…

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## [Command Line Audio Players/Recorders](https://community.unix.com/t/command-line-audio-players-recorders/396348)

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**Author:** [@wisecracker](https://community.unix.com/u/wisecracker)\
**Replies:** 0\
**Last updated:** [January 22, 2025, 12:38pm UTC](https://community.unix.com/t/command-line-audio-players-recorders/396348 "2025-01-22T12:38:04Z")

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Hi guys and gals... 22-01-2025. Apologies for typos, etc... It's your resident amateur here... Those of you who know of me also know what I do, but those that don't here is a quick run down. My platform of choice i…

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## [Javascript if statement](https://community.unix.com/t/javascript-if-statement/396335)

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**Author:** [@jgt](https://community.unix.com/u/jgt)\
**Replies:** 4\
**Last updated:** [January 21, 2025, 3:06pm UTC](https://community.unix.com/t/javascript-if-statement/396335 "2025-01-21T15:06:56Z")

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I have a web page that includes the following javascript, but the if statement does not work. I have tried changing the = sign in the if statement to ==, but that causes the EMPL\_MENU to not execute, and also not show an…

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## [I suddenly completely forgot my ESX(i)-8.0 password! (((](https://community.unix.com/t/i-suddenly-completely-forgot-my-esx-i-8-0-password/396281)

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**Author:** [@freeuser](https://community.unix.com/u/freeuser)\
**Replies:** 2\
**Last updated:** [January 14, 2025, 8:31am UTC](https://community.unix.com/t/i-suddenly-completely-forgot-my-esx-i-8-0-password/396281 "2025-01-14T08:31:25Z")

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It turns out that starting with 7.0, a "manual" password reset is not possible due to the fact that local.tgz is encrypted. The encryption key is located in encryption.info. How and how to decipher this (local.tgz.ve) …

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## [HTML/JS that doesn't display properly](https://community.unix.com/t/html-js-that-doesnt-display-properly/396162)

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**Author:** [@ignatius](https://community.unix.com/u/ignatius)\
**Replies:** 5\
**Last updated:** [January 1, 2025, 4:38am UTC](https://community.unix.com/t/html-js-that-doesnt-display-properly/396162 "2025-01-01T04:38:01Z")

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Hi. I have some problematic HTML and/or JS. Here's some JS. \<script\> const links = { link1: 'http://somesite.com', } let currentIframeId; // top left red button to close the full page iframe const closeBtn = docu…

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## [An ASCII TEXT mode Spec-An in Python 2.0.1 to 3.13.0 without modification](https://community.unix.com/t/an-ascii-text-mode-spec-an-in-python-2-0-1-to-3-13-0-without-modification/395825)

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**Author:** [@wisecracker](https://community.unix.com/u/wisecracker)\
**Replies:** 0\
**Last updated:** [November 24, 2024, 5:26pm UTC](https://community.unix.com/t/an-ascii-text-mode-spec-an-in-python-2-0-1-to-3-13-0-without-modification/395825 "2024-11-24T17:26:28Z")

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\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\* !!!IMPORTANT!!! \*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\* This code uses some escape facilities of the majority of \*NIX Terminals! (Apologies for any typos, etc...) This works on standard terminal…

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## [Java: Display board with user input](https://community.unix.com/t/java-display-board-with-user-input/395700)

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**Author:** [@Ihattaren](https://community.unix.com/u/Ihattaren)\
**Replies:** 4\
**Last updated:** [November 5, 2024, 11:59am UTC](https://community.unix.com/t/java-display-board-with-user-input/395700 "2024-11-05T11:59:32Z")

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\--------- | | | --------- | | | --------- | | | --------- So far, I've created a board like this using this code. public static void printEmptyBoard(int row, int col) { for (int i = 0; i \< row; i++) { …

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## [AppImage not executing](https://community.unix.com/t/appimage-not-executing/395566)

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**Author:** [@ignatius](https://community.unix.com/u/ignatius)\
**Replies:** 14\
**Last updated:** [October 30, 2024, 10:26am UTC](https://community.unix.com/t/appimage-not-executing/395566 "2024-10-30T10:26:56Z")

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Hi. I'm trying to create an AppImage for one of my programs. First things first. Here's some pertinent information: ignatius@ghost:~/igterm.appdir$ tree . |-- AppRun |-- build.sh |-- igTerm |-- igTerm-x86\_64.AppImage …

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## [Swappiness and performance](https://community.unix.com/t/swappiness-and-performance/395686)

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**Author:** [@technossomy](https://community.unix.com/u/technossomy)\
**Replies:** 2\
**Last updated:** [November 3, 2024, 2:37am UTC](https://community.unix.com/t/swappiness-and-performance/395686 "2024-11-03T02:37:12Z")

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I had been experimenting recently with swappiness of my disk on which a home-grown database application written in C runs. The application runs for several hours and generates a couple of gigabyes of data to file and ano…

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## [Makefile $\<?](https://community.unix.com/t/makefile/395647)

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**Author:** [@thierry](https://community.unix.com/u/thierry)\
**Replies:** 4\
**Last updated:** [November 2, 2024, 8:48am UTC](https://community.unix.com/t/makefile/395647 "2024-11-02T08:48:09Z")

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Hello, I am reading this book: How Linux Works. In chapter 15, Development tools, 15.2.6 Standard macros and variables, this little program concerning makefile is presented with very little precision: .in.out: $\< myp…

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## [Solving 4-queen problem: Translate my logic to code? Unable to do so](https://community.unix.com/t/solving-4-queen-problem-translate-my-logic-to-code-unable-to-do-so/395405)

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**Author:** [@Ihattaren](https://community.unix.com/u/Ihattaren)\
**Replies:** 27\
**Last updated:** [October 7, 2024, 7:42am UTC](https://community.unix.com/t/solving-4-queen-problem-translate-my-logic-to-code-unable-to-do-so/395405 "2024-10-07T07:42:32Z")

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Here is my solution. (I only need to find 1 such solution i.e only 1 placement of queen. Not all possible solutions-92) Place a queen on board when there is no conflict with the other queen(diagonalwise, row-wise, col-…

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## [Help to create a firewalld rule to allow connection between a program and service](https://community.unix.com/t/help-to-create-a-firewalld-rule-to-allow-connection-between-a-program-and-service/395419)

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**Author:** [@LMHmedchem](https://community.unix.com/u/LMHmedchem)\
**Replies:** 2\
**Last updated:** [September 29, 2024, 3:37am UTC](https://community.unix.com/t/help-to-create-a-firewalld-rule-to-allow-connection-between-a-program-and-service/395419 "2024-09-29T03:37:32Z")

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Hello, This is on CentOS 7.7 x86\_64. I have a program that need to connect to a service. The program runs fine with firewalld turned off but I get an error about not being able to connect to the service with the firew…

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