grep— search text by patternawk— process text by fields and rulessed— edit text streamsfind— locate files and directoriesxargs— build and run commands from input
mattfsourcecode
mattfsourcecode
/ devops_power5.md
Created
August 23, 2025 02:34
The five core commands—`grep`, `awk`, `sed`, `find`, and `xargs`—that enable efficient search, processing, and automation directly from the command line.
mattfsourcecode
/ Big_O_notation.md
Created
August 23, 2025 02:33
Big O Table: Common time complexities with descriptions.
| Complexity | Runtime Behavior |
|---|---|
| 𝑂(1) | Constant time — work does not grow with input size. |
| 𝑂(log 𝑛) | Logarithmic time — input size reduced at each step. |
| 𝑂(𝑛) | Linear time — processes each element once. |
| 𝑂(𝑛 log 𝑛) | Linearithmic time — divides input and processes each part. |
| 𝑂(𝑛²) | Quadratic time — nested loops over the input. |
| 𝑂(𝑛³) | Cubic time — triple nested loops. |
| 𝑂(2ⁿ) | Exponential time — doubles work for each added element. |
| 𝑂(𝑛!) | Factorial time — generates all permutations. |
mattfsourcecode
/ browser_data_reception_and_rendering.md
Created
August 23, 2025 02:31
Step-by-step explanation of how a web browser receives data, processes it, and displays a webpage, including DNS resolution, TCP handshake, caching, DOM construction, and WebSocket communication.