Category: Uncategorized
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RegEx
https://www.youtube.com/watch?v=sa-TUpSx1JA Meta Characters Meta Character Meaning of the meta character when searching . (dot) any character except new line \d any digit: 0-9 \D not a digit(0-9) \w any word character: a-z, A-Z,0-9, _ \W not word character \s whitespace: space, tab, newline \S not whitespace Anchors: don’t match character but match invisible position before/after…
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Networking: TCP
MTU: MSS: Now how MTU affects GRE or VxLAN or any other tunnelling ? TCP and MTU: TCP recognize Ethernet MTU and can calculate MSS from it. which means, if we set our Ethernet MTU as 9000, TCP will calculate MSS as 8960 bytes.in datacenter, we usually set MTU as 9000 bytes as we control…
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Neetcode: Array and Hashing
Problem 1: Contains Duplicate Given an integer array nums, return true if any value appears at least twice in the array, and return false if every element is distinct. Problem 2: Valid Anagram Given two strings s and t, return true if t is an anagram of s, and false otherwise. An Anagram is a…
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Linux User Management
In Linux, users can be categorised into 3 general categories:
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Linux Basics
https://www.youtube.com/watch?v=UCr04qIB7uc What is Linux? Linux Distributions Family: Linux distribution: When a kernel is bundled with the operating system software and bundled together, that is called Linux distribution. Kernel: Distribution: Bootloader: Services: a program which runs as the background: Filesystem: Method for storing and organising files: Shell: Command line interpreter that interprets the command line input…