auto

6

Гідротрансформатор
Що таке датчик MAP?
Що таке маточина колеса?
Що таке система ESP в автомобілі?
Що означає індекс швидкості на шинах?
Що означає індекс навантаження шин?

bun

13

HTTP Server
Call a C function
Function fetch() over Unix sockets
Start an HTTP server on a unix domain socket with Bun.serve()
Loaders
WebSocket
Read and write file
Hash password
Bundle for browser
Write test
File system routing
Read stream
Spawn a child process

c

39

Графіка та керування у вікні термінала
gcc option -I
gcc option -L
gcc option -l
Preprocessor and Macros
Preprocessor Conditional Compilation
Type size_t
ptrdiff_t
Semaphore
Mutex
NULL - null pointer constant
daemon - run in the background
complex - basics of complex mathematics
INFINITY, NAN, HUGE_VAL, HUGE_VALF, HUGE_VALL - floating-point constants
assert - abort the program if assertion is false
abort - cause abnormal process termination
Preprocessor directive #pragma once
Use of #include guards
Example of code
Example of code
Example of code
Preprocessor features
execve - execute program
Example of code
The do { } while(0) construct in C macros
Function with inline keyword
Example of code
Example of code - tests
C++ Named Operators
The main function
Function Definitions
Function Declarations
Overview of longjmp
setlocale - set the current locale
Find dependencies of c library
Dynamic Memory Allocation
Header Files
printf, fprintf, dprintf, sprintf, snprintf, vprintf, vfprintf, vdprintf, vsprintf, vsnprintf - formatted output conversion
Pointer array definition

common

54

Yoda conditions (Yoda notation)
UTF-8 - an ASCII compatible multibyte Unicode encoding
Software metric
Where should I store the data?
Formatting for Terminals
What is JSON Web Token?
Macros
Search in project directory using grep:
Makefile
Makefile Command Echoing/Silencing
ctags - Generate tag files for source code
Unicode symbol in terminal emulator
HTTP authentication
Challenge-response authentication
HTTP header Authorization
CORS
CRLF
Payload body
Payload header
HTTP header Transfer-Encoding
HTTP header Content-Length
TCP handshake
Unicode:
TCP
Populating the page: how browsers work
Browserslist
doiuse - Lint CSS for browser support against Can I use database
HTTP Using cookies
Content Security Policy (CSP)
HTTP method PUT
HTTP method TRACE
HTTP method POST
HTTP method PATCH
Terminal dynamic text changes, animation
HTTP method OPTIONS
HTTP method HEAD
HTTP method GET
HTTP method DELETE
HTTP method CONNECT
ROT13
Резюме (CV)
HTTP header Location
HTTP header Retry-After
Safe HTTP Methods
command [--optional-flag] [-a -b] [ -c argument ] [-A|-B] filename ...
full - always full device
null, zero - data sink
glob - globbing pathnames
regex - POSIX.2 regular expressions
Pilcrow ¶ - paragraph separator
The ANSI escape sequences
Backus-Naur Form (BNF)
charsets - character set standards and internationalization
man ascii - ASCII character set encoded in octal, decimal, and hexadecimal

computer_science

29

Tail call(tail call optimization)
Binary Trees
Binary Tree Traversal
Array Implementation of Binary Trees
Binary Search Trees
Graphs
The Elements of Programming Style
Rope (data structure)
Data URLs
Percent-encoding
What are the parts of a URL?
Call graph
little-endian
big-endian
Endianness
Opcode
Swizzling (computer graphics)
Digraphs and trigraphs
Sixel
Proof of work
octet
#Binary prefix
Request for Comments, RFC
Virtual methods/functions
Polymprphism
Data Backup
Linked list implementation in python
Stacks
Queues

construction

7

Розрахунок природної вентиляції
Лаги
Деревинноволокниста плита ДВП
eps - пінопласт(пінополістирол) утеплювач
Армування цегляних перегородок
Бетон П4
Бетон B7.5

css

418

Selectors example
Key word max-content
Property writing-mode
Property word-wrap
Property word-spacing
Property word-break
Property width
Property widows
Property white-space
Property visibility
Property vertical-align
Property user-select
Selector pseudo-class :is() and :not()
Property unicode-bidi
Property translate
Property transition-timing-function
Property transition-property
Property transition-duration
Property transition-delay
Property transform-style
Property transform-origin
Property transform
Type <length>: `ch`
Property top
Property text-underline-position
Property text-transform
Property text-shadow
Property text-overflow
Property text-orientation
Property text-justify
Property text-indent
Property text-emphasis
Property text-decoration-thickness
Custom property fallback values
Property text-decoration-style
Property text-decoration-line
Property text-decoration-color
Property text-decoration
Property text-combine-upright
Property text-align-last
Property text-align
Property table-layout
Property tab-size
Property scrollbar-color
A game for learning CSS grid layout
Property scroll-snap-type
Property scroll-snap-stop
Property scroll-snap-align
Property scroll-padding-top
Property scroll-padding-right
Property scroll-padding-left
Property scroll-padding-inline-start
Property scroll-padding-inline-end
Property scroll-padding-inline
Property scroll-padding-bottom
https://flukeout.github.io/
Property scroll-padding-block-start
Property scroll-padding-block-end
Property scroll-padding-block
Property scroll-padding
Property scroll-margin-top
Property scroll-margin-right
Property scroll-margin-left
Property scroll-margin-inline-start
Property scroll-margin-inline-end
Property scroll-margin-inline
Selector pseudo-class :focus-visible
Property scroll-margin-bottom
Property scroll-margin-block-start
Property scroll-margin-block-end
Property scroll-margin-block
Property scroll-margin
Property scroll-behavior
Property scale
Property row-gap
Property rotate
Property right
Add fonts to page:
Property resize
Property quotes
Property position
Property pointer-events
Property place-self
Property place-items
Property place-content
Property perspective-origin
Property perspective
Property paint-order
Property color-scheme
Property page-break-inside
Property page-break-before
Property page-break-after
Property padding-*
Property padding-inline-*
Property padding-block-*
Property padding
Property overscroll-behavior-*
Property overscroll-behavior-*
Property overscroll-behavior
Selector pseudo-class :root
Property overflow
Property overflow-wrap
Property overflow-anchor
Property overflow
Property outline-width
Property outline-style
Property outline-offset
Property outline-color
Property outline
Property orphans
Use :empty to Hide Empty HTML Elements
Property transition
Property order
Property opacity
Property offset-rotate
Property offset-path
Property offset-distance
Property offset-anchor
Property offset
Property object-position
Property object-fit
Property mix-blend-mode
Best Web Safe Fonts for HTML and CSS
Property min-*
Property min-\*-size
Property max-*-size
Selector at-rule @media
Property max-*
Property mask-*
Property margin-*
Property margin-inline
Property margin-block-*
Property margin
CSS function var()
Property list-style
Property line-height
Property line-break
Property letter-spacing
Property left
Property @keyframes
Property justify-self
Property justify-items
Property justify-content
Property isolation
CSS function rgba()
Property inset-inline-start
Property inset-inline-end
Property inset-inline
Property inset-block
Property inset
Property inline-size
Directive at-rule @import
Property image-rendering
Property hyphens
Property height
CSS fnction rgb()
Property hanging-punctuation
Property grid-template-rows
Property grid-template-columns
Property grid-template-areas
Property grid-template
Property grid-row-*
Property grid-row-gap
Property grid-row
Property grid-gap
Property grid-column-gap
Property repeating-radial-gradient()
Property grid-column-...
Property grid-column
Property grid-auto-flow
Peoperty grid-auto-*
Property grid-area
Property grid
Property gap
Property font-weight
Property font-variant-position
Property font-variant-numeric
CSS function repeating-linear-gradient()
Property font-variant-ligatures
Property font-variant-east-asian
Property font-variant-caps
Property font-variant-alternates
Property font-variant
Property font-synthesis
Property font-style
Property font-stretch
Property font-size-adjust
Property font-size
Property repeating-conic-gradient()
Property font-language-override
Property font-kerning
Directive @font-feature-values
Property font-feature-settings
Property font-family
Directive @font-face
Property font
Property float
Property flex-wrap
Property flex-shrink
CSS function radial-gradient()
Property flex-grow
Property flex-flow
Property flex-direction
Property flex-basis
Property flex
Property filter
Property empty-cells
Property display
Property direction
Property cursor
CSS function min()
Property content
Property columns
Property column-width
Property column-span
Property column-rule-width
Property column-rule-style
Property column-rule-color
Property column-rule
Property column-gap
Property column-fill
rem and em units
CSS function max()
Property column-count
Property color
Property clip
Property clear
Directive @charset
Property caret-color
Property caption-side
Property break-inside
Property break-*
Property box-sizing
Property linear-gradient()
Property box-shadow
Property box-reflect
Property box-decoration-break
Property bottom
Property border-width
Property border-top
Property border-style
Property border-*-*-radius
Property border-spacing
Property border-right-*
Property hsla()
Property border-radius
Property border-left
Property border-inline
Property border-inline-end-*
Property border-inline-*
Property border-inline-width
Property border-inline-style
Property border-inline-color
Property border-image-width
Property border-image-source
Property hsl()
Property border-image-slice
Property border-image-repeat
Property border-image-outset
Property border-image
Property border-end-*
Property border-color
Property border-collapse
Property border-bottom
Property border-block-width
Property border-block-style
CSS function cubic-bezier()
Properties `border-block-*`
Property border-block-*
Property border-block-*
Property border
Property block-size
Property background-size
Property background-repeat
Property background-position
Property background-origin
Property background-image
CSS function counter()
Property background-color
Property background-clip
Property background-blend-mode
Property background-attachment
Property background
Property backface-visibility
Property backdrop-filter
Property aspect-ratio
Property animation
Property all
Property conic-gradient()
Property align-self
Property align-items
Property align-content
Property accent-color
CSS function clamp()
Pseudo-class :root
Selector pseudo-class :checked
Selector pseudo-class :disabled
Pseudo-class :focus
Selector pseudo-class :focus-within
CSS function calc()
Selector pseudo-class :invalid
Pseudo-class :lang()
Pseudo-class :link
Pseudo-class :not()
Pseudo-class :only-child
Pseudo-class :optional
CSS media feature prefers-color-scheme
CSS Media Query Range Syntax
HTML Global Attributes
Target size
CSS function attr()
Proportional resizing with CSS variables
Use Cases For CSS fit-content
Selector pseudo-class :has()
CSS Nesting
The Guide To Responsive Design
Accidental hover on mobile
Everything about value key-word auto in CSS
The minimum content size in CSS grid
Centering
The currentColor Keyword
Selector pseudo-class :visited
The good old margin: auto with flexbox
Handling Short And Long Content In CSS
Property text-underline-offset
Property scrollbar-gutter
Selector the :user-valid and :user-invalid pseudo-classes
The @container CSS at-rule - container queries
The ::backdrop CSS pseudo-element
Units
Property appearance
Keep the footer at the bottom
Table cells equal width
Selector pseudo-class :valid
Tree views in CSS
Specificity
Using media queries
At-rule @counter-style
Property hyphens
Combining type and class selectors
Use CSS hex code colors with alpha values
Focus and hover, better accessibility using mouse or keyboard
Property shape-outside
Property mask
Selector pseudo-class :target
tailwindcss Detecting classes in source files
Property text-wrap
Property text-wrap-mode
Property white-space-collapse
Example how you can use css custom variable in html
Function light-dark()
The exclusive accordion
Type (tag name) selector
Namespaces in elemental selectors
Intrinsic size
Pseudo-element ::selection
Pseudo-element :root
Selector pseudo-class :required
Selector pseudo-class :read-write
Selector pseudo-element :read-only
Pseudo-element ::placeholder
Selector pseudo-class :out-of-range
Selector pseudo-class :optional
Set font with local check
Property pseudo-class :only-child
Selector pseudo-class :only-of-type
Selector :nth-of-type(n)
Selector :nth-last-of-type(n)
Selector :nth-last-child(n)
Selector pseudo-class :nth-child(n)
Selector :not(selector)
Selector pseudo-element ::marker
Selector :link
Selector pseudo-class :last-of-type
Property font-size
Pseudo-element :last-child
Pseudo-class :lang(language)
Pseudo-class :invalid
Selector pseudo-class :indeterminate
Selector pseudo-class :in-range
Pseudo-class :hover
Selector pseudo-class :fullscreen
Pseudo-class :focus
Selector :first-of-type
Selector pseudo-element ::first-line
Selectors use
Pseudo-element ::first-letter
Selector pseudo-class :first-child
Pseudo-class :enabled
Selector pseudo-class :empty
Pseudo-class :disabled
Selector :default
Pseudo-class :checked
Pseudo-element ::before
Pseudo-element ::after
Selector pseudo-class :active
Selector example
Selector [attribute*=value]
Selector [attribute$=value]
Selector [attribute^=value]
Selector [attribute|=value]
Selector [attribute~=value]
Selector [attribute=value]
Selector [attribute]
Selector element1~element2
Selector element+element
Selector element > element
Property clip-path
Selector element element
Selector element,element
Selector element.class
Selector html element tag
Selector *
Selector #id
Selector .class1 .class2
Selector .class1.class2
Seector .class
Property z-index

curl

2

GET request method with headers
POST request method with headers

ed

4

We can run Unix shell ('sh')
Line addressing
Commands
Substitute command

electron

1

new BrowserWindow([options])

electronics

2

Wavelength
Опір реактивних компонентів

express_javascript

0

express_typescript

1

Add type for new variable in Request object.

food

1

Соус-закуска «Дзадзикі»

git

48

Show logs between 'master' and 'dev' branches
git rebase
git-restore - Restore working tree files
git-add - Add file contents to the index
git reset
head
HEAD
index
git blame
git merge --abort
git-hook - Run git hooks
git commit --no-verify
This will show the entire history of the file
git bisect
git config --list
git commit -p | --patch
git log -S<string>
git ls-files - Information about files in the index and the working tree
Refs
Collaboration
Branches
Forget about a file that was tracked, but is now in .gitignore?
Ranges
git log - search
git diff --shortstat
Set custom directory for git hooks
git commit messages template
Better commit message
View a file of another branch
Take a backup of untracked files
Count your commits
Automate git bisect - bisect run
Terminal alias
Refs
Collaboration
Branches
Diff
Short log
Searching
GPG signing
Bisect
Comparing files from two branches
git-column - Display data in columns
zsh alias for push branch to remote repository
git switch
git log snippet
git-rebase
git rebase

github-gitlab

3

Understanding GitHub Code Search syntax
Generating a new GPG key
Link to a code

gjs

1

GJS

gnome

1

sysprof - profiling tool of the entire Linux system

heap

1

OpenCV

html

117

Global attribute - inputmode
Tag <tr>
Tag <b>
Tag <audio>
Tag <aside>
Tag <article>
Tag <area>
Tag <address>
Tag <abbr>
Tag <a>
<!DOCTYPE>
Comments
Tag <title>
Attribute preload
Attribute prefetch
Global attribute - popover
Top layer
Tag <hgroup> the heading group element
Element dialog
Replaced elements
Void element
Tag <time>
Tag <thead>
Tag <th>
#Tag <tfoot>
Tag <textarea>
Tag <template>
Tag <td>
Tag <tbody>
SVG-файл становится контейнером таких символов:
Tag <table>
Tag <svg>
Tag <sup>
Tag <summary>
Tag <sub>
Tag <style>
Tag <strong>
Tag <span>
Tag <source>
Tag <small>
Accessibility
Tag <select>
Tag <section>
Tag <script>
Tag <samp>
Tag <s>
Tag <rt>
Tag <rp>
Tag <q>
Tag <progress>
Tag <pre>
Tag <wbr>
Tag <picture>
Tag <param>
Tag <p>
Tag <output>
Tag <option>
Tag <optgroup>
Tag <ol>
Tag <object>
Tag <noscript>
Tag <nav>
Tag <video>
Tag <meter>
Tag <meta>
Tag <mark>
Tag <map>
Tag <main>
Tag <link>
Tag <li>
Tag <legend>
Tag <label>
Tag <kbd>
Tag <var>
Tag <ins>
Tag <input>
Tag <img>
Tag <iframe>
Tag <i>
Tag <html>
Tag <hr>
Tag <header>
Tag <head>
Tags <h1> to <h6>
Tag <ul>
Tag <form>
Tag <footer>
Tag <figure>
Tag <figcaption>
Tag <fieldset>
Tag <embed>
Tag <em>
Tag <dt>
Tag <dl>
Tag <div>
Tag <u>
Tag <dialog>
Tag <dfn>
Tag <details>
Tag <del>
Tag <dd>
Tag <datalist>
Tag <data>
Tag <colgroup>
Tag <col>
Tag <code>
Tag <track>
Tag <cite>
Tag <caption>
Tag <canvas>
Tag <button>
Tag <br>
Tag <body>
Tag <blockquote>
Tag <bdo>
Tag <bdi>
Tag <base>

javascript

64

Re-exports
Object.defineProperties()
Static method Object.defineProperty()
Static method Object.entries()
Static method Object.freeze()
Static method Object.fromEntries()
Static method Object.hasOwn()
Static method Object.is()
Static method Object.isExtensible()
Static method Object.isFrozen()
Static method Object.isSealed()
Save text as file from browser:
Static method Object.keys()
Static method Object.preventExtensions()
Static method Object.seal()
Static method Object.values()
Array.prototype.sort()
Operator precedence
Reverse array
Client-side form validation
Array Methods and Properties
Date Methods and Properties
Operator spread
Number Methods and Properties
Object Methods and Properties
String Methods
Function window.matchMedia()
Object prototype
Tree shaking css
Global function structuredClone()
Using ES2015 Modules in Browsers
try/catch is Ugly
Detect/check user color scheme preference
Function console.assert()
fetch data as json
Monitor events from chromium base console panel
Errors and Testing
Throwing a Standard Error
Identifying unused javascript
Sending binary data and loading into an image
Adding JavaScript to SVG
Base64
How to change mock implementation on a per single test basis?
jest mock functions
devtools console.log() with style
jest.replaceProperty(object, propertyKey, value)
Function jest.mocked(source, options?)
DataView
JSDoc mark variable as const like in typescript as const
Array.from({ length: 10 })
Example how to write good function with validation
Validation functions from node.js source code /lib/internal/validators.js
Handler for http status code
Helper functions
Example of defined user fields data/object/struct
Зміна або заміна об’єкта під час копіювання
Horizontal scroll by mouse
Example of use c preprocessor (cpp)
Event oncontextmenu
Function Element.closest()
Transient activation
Перенесення тексту
Static method Object.assign()
Static method Object.create()

law

2

ЗАКОН УКРАЇНИ Про охорону дитинства
ЗАКОН УКРАЇНИ Про охорону дитинства

linux

63

gsettings
core - core dump file
System signals SIGTERM and SIGQUIT
cron with notify-send
environ - user environment
Terminal command notify-send
Move window
fifo - first-in first-out special file, named pipe
Get/set gnome wallpaper from terminal/cli
Desktop Application Autostart
du - estimate file space usage
dconf
od - dump files in octal and other formats
ss - another utility to investigate sockets
unix - sockets for local interprocess communication
boot - System bootup process based on UNIX System V Release 4
man console_codes - Linux console escape and control sequences
ssh run command only
getconf - Query system configuration variables
gdb - The GNU Debugger
ldd - print shared object dependencies
free - Display amount of free and used memory in the system
daemon - Writing and packaging system daemons man 7 daemon
GNU Octave - Scientific Programming Language
sdiff - side-by-side merge of file differences
diff - compare files line by line
Quickly list all the available users on your system
sshfs - s a filesystem client
spell-checking
chvt - change foreground virtual terminal
apropos - search the manual page names and descriptions
w - Show who is logged on and what they are doing
dex - DesktopEntry Execution
systemctl - Control the systemd system and service manager
dpkg - package manager for Debian
passwd - change user password
cron
cpp - The C Preprocessor
tload - graphic representation of system load
Create and modify user accounts
I2C and SMBus Subsystem
Serial Peripheral Interface (SPI)
LED handling under Linux
wtype - is a Wayland tool that allows you to simulate keyboard input
chsh - change login shell
evtest - Input device event monitor and query tool
List of icon name for notify-send or linux app
killall - kill processes by name
stat - display file or file system status
Android Debug Bridge - adb
rsync - a fast, versatile, remote (and local) file-copying tool
Best way to transfer files over a LAN between two Linux computers
Terminal pager
Default terminal
pass - stores, retrieves, generates, and synchronizes passwords securely
Switching to fish
locale - description of multilanguage support
chattr - change file attributes on a Linux file system
lsattr - list file attributes on a Linux second extended file system
Managing Services with systemd
hostname - show or set the system's host name
crontab - maintain crontab files for individual users (Vixie Cron)
signal - overview of signals

makefile

8

Special Built-in Target Names
Special Built-in Target Names
MAKEFLAGS
Variables
Choosing the Shell
Multiline
Create a self-documenting Makefile
make -j option

markdown

15

Headers
Horizontal Rule
Task lists
Accessible tables
Math
Heading IDs and links
Keyboard HTML tag
Emphasis
Lists
Links
Images
Code and syntax highlighting
Footnotes
Tables
Blockquotes

math

3

Boolean algebra
Коло
Круг

nginx

5

Configuration file
Starting, Stopping, and Reloading Configuration
Serving Static Content
Setting Up a Simple Proxy Server
Use a Reverse Proxy Node.js

node.js

28

Clear terminal screen
built-in .env file support(Node v20.6.0)
List installed packages
Update packages
Check for outdated packages
Use `npm outdated` for install latest packages versions ignoring semver
npm package.json field - main
npm package.json field - bin
npm package.json field - man
npn package.json field - dependecies
Node.js cli options debugging
How to download a file with Node.js
Node.js V8 Inspector
Debugging Node.js application with Chromium
Useful Node.js APIs
Streams
Create an HTTP server
Write tests
Streams pipeline
Work with threads
VM context, or Virtual Machine context
Run if
nodemon config file
os.tmpdir()
Marker os.EOL
fs.mkdtemp - Creates a unique temporary directory
Get bytecode of file/function
Semantic versioning

node.js_typescript

1

Add hints for environment variable

physics

0

playwright

3

Page object models(POM)
Pages
Locate by CSS or XPath

python

16

List installed packages, including editables.
Built-in Functions
typing — Support for type hints
Unpacking
Modules, packages
How do I get the path of the Python script I am running in?
How to check whether a file is empty or not
__pycache__
Classes and Objects
Python Virtual Environment
pip - common tasks
pip freeze
Requirements File Format
Using the dir() Function
Python Data Types
The global Keyword

r

17

Data frame
Function str()
Function sebset() - Return subsets of vectors, matrices or data frames which meet conditions
How to suppress display of data.frame row numbers?
How to sort a data frame by column
How to filter a data frame
Data Manipulation in R: 'X' must be atomic
Function legend()
function par()
substr - Extract or replace substrings in a character vector
Vector
Function sum - Sum of Vector Elements
Function paste - Concatenate Strings
Function nchar - Count the Number of Characters (or Bytes or Width)
Getting help with functions and features
How to add a column to a data frame
Generating regular sequences

react

0

redis

5

redis-cli --scan - List of keys
FLUSHDB
FLUSHALL
DEL
How to start and stop server

regexp

0

scss

11

Variables
Built-in module sass:color
@use
Partials files
Modules
Mixins
Extend/Inheritance
Operators
Nesting
Parent selector
Placeholder selectors

sqlite

28

To remove all rows in the table
Adding data to a table
Updating data in a table
Deleting data from a table
BINARY LARGE OBJECT (BLOB)
Foreign key constraints
Range query
Prefix match query
Extremal query
Ordering query
Grouping query
DROP TABLE
COUNT
Function AVG
MAX | MIN
IN and NOT IN
LIKE and NOT LIKE
NULL
DELETE statement
RETURNING clause
Subquery
Show Tables
Command line shell for SQLite (CLI)
Transaction
THE RELATIONAL DATABASE HIERARCHY
Modifying tables
Removing tables and other objects
Retrieving data from a database

terminal_bash

125

Knowing what the default terminal emulator
Editors environment variables
Numeric calculations
Redirection
$! - PID of last background task
yes - output a string repeatedly until killed
whiptail - display dialog boxes from shell scripts
Example of use commands
Example of use cat + EOF heredoc
esh - simple template system based on shell
pandoc - general markup converter
run-parts - run scripts or programs in a directory
Print all fields of a record except last
Finding the differences between files and patch
hexdump - display file contents in hexadecimal, decimal, octal, or ascii
To insert several lines of text at the beginning of the ﬁle
Including text from other files
Combine files and output as table
calendar — reminder service
Counting lines use sed command
Printing the first lines use sed
bash keyword declare
apg - generates several random passwords
grep show lines before and after match
strftime - format date and time
getfacl - get file access control lists
alacritty - terminal emulator
Run a command in the background
ShellCheck - A shell script static analysis tool
How can I redirect the output of multiple commands at once?
Parameter expansion
Arithmetic Expansion
Remove first and last characters from a string
Format console output in columns
Remove characters from a variable
Check if a number is even
tee - read from standard input and write to standard output and files
Change directory and show files
test - check file types and compare values
Bash function variables
nl - number lines of files
file — determine file type
builtin bash commands
paste - merge lines of files
pr - convert text files for printing(row to column)
split - split a file into pieces
Break one column into multiple columns
Remove empty/blank lines
Standart descriptors
Select specific rows and columns
join - join lines of two files on a common field
mktemp - create a temporary file or directory
pwdx - report current working directory of a process
strace - trace system calls and signals
df - report file system disk space usage
man-pages - conventions for writing Linux man
C-like for loop syntax for ksh93/bash/zsh
variable COLUMNS
colrm - remove columns from a file
Glob pattern
xdg-open
dirname - strip last component from file name
readlink - print resolved symbolic links or canonical file names
adduser, addgroup - add or manipulate users or groups
anacron - runs commands periodically
.desktop file
graphviz - rich set of graph drawing tools
Join 2 files with some ids
How to replace an entire line in a text file by line number
ps - report a snapshot of the current processes
Redirect one terminal command output to another terminal window input
wget - The non-interactive network downloader
getopt - parse command options (enhanced)
nc — arbitrary TCP and UDP connections and listens
Install
pkill, pgrep, pidwait
Trim extra whitespace between characters
lynx - browser
sort by first column starting on 4th character
type - indicate how each name would be interpreted if used as a command name
realpath - print the resolved path
man test - check file types and compare values
expand - convert tabs to spaces
printf - format and print data
Combine text files column-wise
How to get number of days in a month
mkfifo - make FIFOs (named pipes)
tput, reset - initialize a terminal or query terminfo database
shuf - generate random permutations
time - run programs and summarize system resource usage
comm - compare two sorted files line by line
Hyperlinks in terminal emulators
For check arguments:
nslookup - query Internet name servers
dnsmasq - A lightweight DHCP and caching DNS server
basenc - Encode/decode data and print to
csplit - split a file into sections determined by context lines
fmt - simple optimal text formatter
Command strings
Ctrl + Z
Ctrl + D
Ctrl + L
Ctrl + W
sed - print line/s
Ctrl + U
expect - programmed dialogue with interactive programs
m4 — macro processor
pv - monitor the progress of data through a pipe
fuser - identify processes using files or sockets
lsof - list open files
env - run a program in a modified environment
Grabbing the cron environment
ANSI escape sequence
How to concatenate string variables in Bash
find - search for files in a directory hierarchy
tail -F - monitor a file
Special variables
set - command syntax
The double-parentheses construct (( ... ))
Special variables to refer to arguments
Parameter expansions - basics
Parameter expansions - Substitution
Parameter expansions
Array
Dictionaries

tmux

9

Multiple screens and send commands
Split the current panel
Show clock by pressed C-b t
Example of config file ~/.tmux.conf
Pane
Switch to pane to the direction
Window conver, next, select
Close current pane
Scroll

typescript

49

File is module or script
Utility type Required<Type>
Utility type Readonly<Type>
Utility type Record<Keys, Type>
Utility type Pick<Type, Keys>
Utility type Omit<Type, Keys>
Utility type Exclude<UnionType, ExcludedMembers>
Utility type Extract<Type, Union>
Utility type NonNullable<Type>
Utility type Parameters<Type>
Utility type ConstructorParameters<Type>
Type merge, intersection, generic
Utility type ReturnType<Type>
InstanceType<Type>
ThisParameterType<Type>
Utility type OmitThisParameter<Type>
Utility type ThisType<Type>
Intrinsic String Manipulation Types
Declaration merging
Function arguments - list vs spred operator
readonly tuple types
Type: void
Indexable types
Export statements
Export all as x
Shorthand ambient modules
Namespace
User-defined type guards
Index signatures
Deep keyof of a nested object
Declaration file
Declaration files modules vue example
Global Libraries
Literal types
Dependencies on global libraries
Global variables and functions
Objects with Properties
TypeScript casting
Recursive Partial type
Triple-slash directives
UnaryFunction interface
Template Literal Types
Branded types
const enum
Cast type const a = (expr as any) as T;
Template literal types
declare global
Utility type Awaited<Type>
Utility type Partial<Type>

useful_know

26

Деревне вугілля
Binary-to-text encoding
Різновиди вуглеводів
13 найкращих ефірних олій і як вони можуть бути корисними для здоров'я
Геотекстиль
Greek primordial deities
Tally marks
Атмосферний тиск
Стратагема
Thirty-Six Stratagems
Personal stemp honko
Окопна свічка
Піноскло
Парціа́льний тиск
Марка цегли
Гіперзвукова швидкість
Швидкість звуку
Пастеризація
Metric prefix
Лій
Каганець(олійна лампа)
Ґніт
Шведський смолоскип
Тяга (різниця тисків)
Потрійна точка води
Ефірні олії

vim

85

Open a file in vim in a new window:
change the line after 50 character
Buffers
:bd - deletes the current buffer, error if there are unwritten changes
Autocomplete
Jump to column number
3 ways to delete in insert mode
Move the cursor around screen:
Session
Move to n line
Move a paragraph
Close all open tabs at once `:qa`
e - move to the end of the word
R - replace many characters
Delete a character
`D` Delete to the end of the line
Change
Change word
See all settings
Call UNIX commands(sh, bash, ...)
Split window(file/s)
Move beetwen window
Disable syntax highlighting
vim path to help files
Syntax highlighting
Hide EndOfBuffer(~) symbol set fillchars=eob:\
Editing a file
Writing and quitting
Multi-window commands
Scrolling
Special inserts
External commands
Various commands
r - replace a single character
Starting Vim arguments
skeleton template
Single repeats dot symbol .
wildmenu - command-line completion
'fillchars' 'fcs' string (default "vert:|,fold:-,eob:~")
Jump to a specific character
Powerful the :r! command
Useful ex command is :so (short for :source)
Macros
Editing - delete + insert
cc - change(replace) entire line
Format text - columns
Change character case
Go to character
Copy use ed commands
Move used ed commands
Start editing the file under cursor
Sorting text
Left-right motion
Up-down motions
Window
cw - change(replace) to the end of the word
Windows introduction
nvim terminal
Joining two lines with J
Count
Meet Insert Normal Mode
The expression register
Insert unusual characters by character code
Insert unusual characters by digraph
Execute Normal mode commands
Tab-Complete your ex commands
Go to line "n"
Opening the file explorer(netrw)
Jump between matching parentheses and jump between matching keywords
Jump to the filename under the cursor
Build a list of target files - open files/buffers
Execute the macro in parallel
Meet vim’s keyword autocompletion
Repeat find next character
nvimtree plugin
modeline
Create vim help .txt file
I - insert at the beginning of the line
Search word under cursor
Insert special characters - digraphs
nvchad default mappings
--embed
--headless
-es -Es -s-ex silent-mode
Start vim in insert mode

vscode

5

Toggle side bar
Ctrl+G Go to n Line...
Ctrl+ Home / End Go to beginning/end of file
Insert line
Fold/Unfold all regions(functions)

vue

66

Vue test utils setProps()
Directive v-model
Directive v-slot
Directive v-pre
Mixing local and global styles
Function v-bind() in CSS
Function createApp()
Function app.mount()
Function app.unmount()
Function app.component()
Function app.directive()
Testing Composables
Function app.use()
Function app.provide()
app.config.globalProperties
Function nextTick() waiting for the next DOM update
Function defineComponent()
Function defineAsyncComponent()
Function ref()
Function computed()
Function reactive()
Function readonly()
Composables
Function hook watchEffect()
Function watch()
Function provide()
Function inject()
3.3 Generic components
3.4 v-bind same-name shorthand
Built-in Components <Transition>
Built-in Components <TransitionGroup>
Built-in Components <KeepAlive>
Built-in Component <Teleport>
Directive v-text
Built-in Special Elements <template>
Built-in Special Elements <slot>
Built-in special elements <component>
Built-in Special Attributes `key`
Built-in Special Attributes ref
Built-in special attributes is
Dynamic Components
Recursive Components
Namespaced Components
Function defineProps() & defineEmits()
Directive v-show
Function defineModel()
Function defineExpose()
Function defineOptions()
Function defineSlots() - Typescript
Functions useSlots() & useAttrs()
Usage alongside normal <script>
Top-level await
Generics - Typescript
SFC CSS Features - mixing local and global styles
CSS Modules
Directive v-if
Function h()
Function mergeProps()
Function cloneVNode()
Function withDirectives()
Function withModifiers()
Function renderToString()
SFC CSS Features - :deep()
Directive v-for
Directive v-on
Directive v-bind

war

18

Азимут
Гуля́й-го́род
Мантелет
Циркумвалаційна лінія
Габіон
Амбразура
Бійниця
Бруствер
Редан
Траверс
Траверс
Рокада
Бастіон
Спіраль Бруно
Капонір
Кофр
Звіроловна яма (вовчі ями)
Часник

Check if a number is even

the bitwise operator

newY="281"
eCheck=$(( $newY & 1 ))