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Posted inComputer Security How tos Linux

Get HTTP headers

Linux - view HTTP header response using curl, httpie, GET, nmap Most users are interested in the content…
Posted by daniel August 2, 2020
Posted inComputer Security How tos Linux

Install free ssl certificates in Ubuntu

Free SSL certificates with Let's Encrypt certbot - tested in Ubuntu 14.04 with Apache 2. It is nice…
Posted by daniel June 10, 2017
Posted inComputer Security How tos Linux

Setup your own self signed Certificate Authority (CA)

How to be your own Certificate Authority(CA) with self signed certificates This is a hands on tutorial on…
Posted by daniel March 12, 2017
Posted inComputer Security How tos Linux

AIDE installation and setup

AIDE (Advanced Intrusion Detection Environment) setup AIDE is a host-based file and directory integrity checking tool, similar to…
Posted by daniel March 12, 2017
Posted inComputer Security How tos Linux

ngrep – insecure connections your browser is making

Ngrep is a very user friendly packet sniffer, basically the "grep" equivalent at the network layer. Here is…
Posted by daniel December 26, 2016
Posted inComputer Security How tos Linux

Block all users from logging in to a system except for root

In some cases, you might want to block all users from logging in to the system or just…
Posted by daniel December 23, 2016
Posted inComputer Security Linux Miscellaneous

Ansible vault – how to encrypt sensitive data and decrypt it during playbook runs

Sooner or later, you will find yourself adding sensitive data into Ansible playbooks, host or group vars files.Such…
Posted by daniel December 1, 2015
Posted inComputer Security How tos Linux

Decoding firefox cookies – sqlite cookies viewer

Web sites store information on local machines of site visitors using cookies. On subsequent visits, the browser sends…
Posted by daniel April 24, 2015
Posted inComputer Security Linux Scripting

Linux security tip of the day

Users accounts usually get created and removed on most Development or Production servers. It is not uncommon to…
Posted by daniel December 12, 2013
Posted inComputer Security How tos Linux

Could not chdir to home directory: Permission denied

Problem: every time a user logs in, they get "Could not chdir to home directory....Permission denied" error, although…
Posted by daniel December 11, 2013

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  • “The 2026 Enterprise Linux Roadmap: 5 Fundamental Skills for Large-Scale Ops” January 19, 2026 daniel
  • Top 10 Reasons to Learn Linux Commands December 8, 2024 daniel
  • Top 10 Advanced Linux Commands for Cloud Engineers March 2, 2024 daniel
  • Debug connection performance with curl February 11, 2023 daniel
  • Netstat alternative – dump socket statistics with ss August 18, 2022 daniel
  • Linux / Bash – generate a sequence of numbers April 10, 2021 daniel

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Categories
  • Amazon web services AWS
  • c-programming
  • Computer Security
  • Containers
  • How tos
  • Internet policy
  • Linux
  • Miscellaneous
  • Personal Finance
  • Scripting
  • Stand-up comedy
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  • “The 2026 Enterprise Linux Roadmap: 5 Fundamental Skills for Large-Scale Ops”
    by daniel
    January 19, 2026
  • Top 10 Reasons to Learn Linux Commands
    by daniel
    December 8, 2024
  • Top 10 Advanced Linux Commands for Cloud Engineers
    by daniel
    March 2, 2024
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