`TIL` stands for "Today I Learned" - the original name of my page for storing notes. ### TIL #37: 2025.08.23 - How to archive a directory using tar? - How to extract tar archive? - How to show default server interface configuration with Ansible? - How to run a command against single server from Ansible inventory? - How to download server certificate using openssl? --- ### TIL #36: 2025.07.29 - How to run a single command on remote server using Ansible? --- ### TIL #35: 2025.07.13 - What etc-skel directory is used for? - How to change location of skel files? - How to add a user to the group? --- ### TIL #34: 2025.06.29 - How to find home directory for the user? - What’s the difference between useradd and adduser? - How to create a new user on Linux? --- ### TIL #33: 2025.06.26 - How to checkout to remote branch? - How to find files the process has opened? - How to find detailed info about process? - How to change default shell for the user? --- ### TIL #32: 2025.06.18 - Basic global configuration in Git --- ### TIL #31: 2025.06.14 - How to install deb package using dpkg? --- ### TIL #30: 2025.06.13 - How to change URL for remote repository? --- ### TIL #29: 2025.05.27 - How to print env variable in Windows cmd? --- ### TIL #28: 2025.05.22 - How to display UDP ports Linux listens on? - What is Azure Spot VM? - How to find package versions available in apt? - How to send stdout from containers to remote syslog server? --- ### TIL #27: 2025.05.21 - How to list available VM images in Azure? - How to Verify if Service Principal Works? - How to list available VM sizes? - What is cURL? - How to display performance data with curl? --- ### TIL #26: 2025.05.20 - What is Service Principal? --- ### TIL #25: 2025.05.19 - Creating Service Principal in Azure with Azure CLI - Azure Subscription - Terraform Azure Authentication using Service Principal --- ### TIL #24: 2025.05.14 - Finding a zombie process origin - How to find parent process for selected PID? - How to add a newfile character at the end of file? --- ### TIL #23: 2025.05.08 - YANG framework is not operating - issue on IOS-XR devices - Which files are opened by which process? - What is process in Linux? - How to kill a process? - How to restart process in Linux? - What is Zombie Process? - What is Signal in Linux? - Shortening Path Displayed in Bash Prompt - Run a command as a different user - Running command in the background - Sending a file to Linux server using SCP - How to set the timezone on Linux? - Disable Password-based authentication in SSH - ISO8601 --- ### TIL #22: 2025.04.27 - Where books are stored in macOS from Books app? - How to zip a file with a password on macOS? --- ### TIL #21: 2025.04.26 - What is lru_cache in Python? - How lru_cache works in Python? --- ### TIL #20: 2025.04.25 - What is Challenge password in SSL? --- ### TIL #19: 2025.04.23 - How to create CSR with a priv key and Alternative Names? --- ### TIL #18: 2025.04.21 - How to delete remote branch in Git repo? - What is source and target branch in git rebase? --- ### TIL #17: 2025.04.20 - What is the difference between LRU and LFU cache? --- ### TIL #16: 2025.04.19 - Git Rebase - Git Branching Strategy - GitLab Flow - What is the default cache algorithm Redis use? - What is LRU Cache? - What is LFU Cache? --- ### TIL #15: 2025.04.02 - How to deal with base64 using PowerShell? - Base64 Encoding --- ### TIL #14: 2025.03.20 - What does 2>&1 mean? --- ### TIL #13: 2025.03.19 - Creating a self-signed root certificate - OpenSSL Config File --- ### TIL #12: 2025.03.14 - String interpolation in Bash - Why secret vars from library group are not set as environment variables automatically? - How to include secret values in NaC DataModel? --- ### TIL #11: 2025.03.13 - String interpolation in Bash - Pipeline_(bash) - How to make script immediately exit when step fails? --- ### TIL #10: 2025.03.03 - What is default network mode that Docker operates in? - How to generate random id in Terraform? --- ### TIL #9: 2025.02.25 - What could be the key in dictionary? - What does it mean that object is hashable? --- ### TIL #8: 2025.02.04 - Log Linear Time Complexity --- ### TIL #7: 2025.01.29 - What's the difference between Trie and Radix Tree? --- ### TIL #6: 2025.01.28 - What is Trie? - Benefits of using Trie data structure - Why it’s called trie instead of tree? - Leaf (data structure) - Node (data structure) - Base64 encoding in Python - How to run simple Python HTTP Server? --- ### TIL #5: 2025.01.27 - Linux page - How to calculate MD5 checksum for a file? - How to find the biggest files in directory --- ### TIL #5: 2025.01.26 - Quadratic Time Complexity - O(n2) - Radix Tree --- ### TIL #4: 2025.01.25 - Big O Notation - O(1) Time Complexity - O(n) Time Complexity - O(log n) Time Complexity - Why do we care about growth trend rather than actual time in Big O Notation? - What is time complexity for Python built-in functions? - Imperative Approach - IaaC - Declarative Approach - IaaC - Infrastructure as a Code - What is idempotency? --- ### TIL #3: 2025.01.24 - What is Dangling Image? - How to list all dangling images in Docker? --- ### TIL #2: 2025.01.23 - How to delete multiple users with associated homedir? - Shortening Path Displayed in Bash Prompt - String Interpolation in Terraform --- ### TIL #1: 2025.01.22 - How to remove unused Docker images?