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shell script ๊ธฐ์ดˆ

#!/bin/sh
echo -e "Hello\n$NAME!" #๊ฐœํ–‰๋œ๋‹ค.
#!/bin/bash
echo -e "Hello\n$NAME!" #๊ฐœํ–‰๋œ๋‹ค.

https://fopman.tistory.com/137

PATH(bash)

vi /etc/bash.bashrc

A collection of useful .gitignore templates

  • .gitignore์„ธํŒ… ์–ธ์–ด๋ณ„๋กœ ๋‹ค ์ •๋ฆฌ๋˜์–ด ์žˆ๋‹ค. ๊ตฟ ๐Ÿ‘๐Ÿ’•๐Ÿ™Œ


.DS_Store๋งŒ gitignore[๐Ÿ”]

echo ".DS_Store" >> .gitignore 

fishshell์šฉ echo๋กœ gitignore๋„ฃ๊ธฐ[๐Ÿ”]

echo "# Result" >> README.md &&
echo "" >> README.md &&
echo "```bash" >> README.md &&
echo "" >> README.md &&
echo "```" >> README.md &&
echo "" >> README.md &&

echo "# Visual Studio 2015/2017 cache/options directory" >> .gitignore &&
echo ".vs/" >> .gitignore &&
echo "" >> .gitignore &&
echo "# A collection of useful .gitignore templates " >> .gitignore &&
echo "# https://github.com/github/gitignore" >> .gitignore &&
echo "# General" >> .gitignore &&
echo ".DS_Store" >> .gitignore &&
echo "dir/otherdir/.DS_Store" >> .gitignore &&
echo "" >> .gitignore &&

echo "# VS Code files for those working on multiple tools" >> .gitignore &&
echo ".vscode/" >> .gitignore &&
echo "# Generated by Cargo" >> .gitignore  &&
echo "# will have compiled files and executables" >> .gitignore &&
echo "debug/" >> .gitignore &&
echo "target/" >> .gitignore &&
echo "" >> .gitignore &&

echo "# Remove Cargo.lock from gitignore if creating an executable, leave it for libraries" >> .gitignore &&
echo "# More information here https://doc.rust-lang.org/cargo/guide/cargo-toml-vs-cargo-lock.html" >> .gitignore &&
echo "Cargo.lock" >> .gitignore &&
echo "" >> .gitignore &&

echo "# These are backup files generated by rustfmt" >> .gitignore &&
echo "**/*.rs.bk" >> .gitignore &&
echo "" >> .gitignore &&

echo "# MSVC Windows builds of rustc generate these, which store debugging information" >> .gitignore &&
echo "*.pdb" >> .gitignore &&
echo "" >> .gitignore &&

echo "# WASM" >> .gitignore &&
echo "pkg/" >> .gitignore &&
echo "/wasm-pack.log" >> .gitignore &&
echo "dist/" >> .gitignore

Rust .gitignore (macOS, LinuxOS)

echo "# Result\xa\xa\x60\x60\x60\xa\xa\x60\x60\x60" >> README.md &&

echo "# A collection of useful .gitignore templates " >> .gitignore &&
echo "# https://github.com/github/gitignore\xa" >> .gitignore &&
echo "# General" >> .gitignore &&
echo ".DS_Store" >> .gitignore &&
echo "dir/otherdir/.DS_Store\xa" >> .gitignore &&

echo "# VS Code files for those working on multiple tools" >> .gitignore &&
echo ".vscode/\xa" >> .gitignore &&
echo "# Generated by Cargo" >> .gitignore  &&
echo "# will have compiled files and executables" >> .gitignore &&
echo "debug/" >> .gitignore &&
echo "target/\xa" >> .gitignore &&

echo "# Remove Cargo.lock from gitignore if creating an executable, leave it for libraries" >> .gitignore &&
echo "# More information here https://doc.rust-lang.org/cargo/guide/cargo-toml-vs-cargo-lock.html" >> .gitignore &&
echo "Cargo.lock\xa" >> .gitignore &&

echo "# These are backup files generated by rustfmt" >> .gitignore &&
echo "**/*.rs.bk\xa" >> .gitignore &&

echo "# MSVC Windows builds of rustc generate these, which store debugging information" >> .gitignore &&
echo "*.pdb\xa" >> .gitignore &&

echo "# WASM" >> .gitignore &&
echo "pkg/" >> .gitignore &&
echo "/wasm-pack.log" >> .gitignore &&
echo "dist/" >> .gitignore
  • WindowsOS(PowerShell)
echo "# Result`r`n`r`n```````n`r`n```````n" >> README.md &&
echo "/target`r`nCargo.lock`r`n" >> .gitignore
  • WindowsOS(PowerShell) ver.2
echo "# A collection of useful .gitignore templates/`r`n# https://github.com/github/gitignore/`r`n# General/`r`n.DS_Store/`r`n `r`n# Generated by Cargo`r`n# will have compiled files and executables`r`ndebug/`r`ntarget/`r`n `r`n# Remove Cargo.lock from gitignore if creating an executable, leave it for libraries`r`n# More information here https://doc.rust-lang.org/cargo/guide/cargo-toml-vs-cargo-lock.html`r`nCargo.lock`r`n `r`n# These are backup files generated by rustfmt`r`n**/*.rs.bk`r`n `r`n# MSVC Windows builds of rustc generate these, which store debugging information`r`n*.pdb`r`n" >> .gitignore && echo "# Result`r`n`r`n```````n`r`n```````n" >> README.md

https://devblogs.microsoft.com/scripting/powertip-new-lines-with-powershell/

  • macOS & LinuxOS
echo "/target\xa\.DS_Store\xa/.vscode\xa# Generated by Cargo\xa# will have compiled files and executables\xadebug/\xatarget/\xa# Remove Cargo.lock from gitignore if creating an executable, leave it for libraries\xa# More information here https://doc.rust-lang.org/cargo/guide/cargo-toml-vs-cargo-lock.html\xaCargo.lock\xa# These are backup files generated by rustfmt\xa*/*.rs.bk\xa# MSVC Windows builds of rustc generate these, which store debugging information\xa*.pdb\xadist/\xapkg/\xa" >> .gitignore &&
echo "# Result\xa\xa\x60\x60\x60\xa\xa\x60\x60\x60" >> README.md
  • Rust .gitignore
# A collection of useful .gitignore templates
# https://github.com/github/gitignore
# General
.DS_Store

# Generated by Cargo
# will have compiled files and executables
debug/
target/

# Remove Cargo.lock from gitignore if creating an executable, leave it for libraries
# More information here https://doc.rust-lang.org/cargo/guide/cargo-toml-vs-cargo-lock.html
Cargo.lock

# These are backup files generated by rustfmt
**/*.rs.bk

# MSVC Windows builds of rustc generate these, which store debugging information
*.pdb
  • WASM + Rust.gitignore
# A collection of useful .gitignore templates 
# https://github.com/github/gitignore

# General
.DS_Store

# VS Code files for those working on multiple tools
.vscode/

# Generated by Cargo
# will have compiled files and executables
debug/
target/

# Remove Cargo.lock from gitignore if creating an executable, leave it for libraries
# More information here https://doc.rust-lang.org/cargo/guide/cargo-toml-vs-cargo-lock.html
Cargo.lock

# These are backup files generated by rustfmt
**/*.rs.bk

# MSVC Windows builds of rustc generate these, which store debugging information
*.pdb

# WASM
pkg/
/wasm-pack.log
dist/

C .gitignore

# macOS general
.DS_Store

# Prerequisites
*.d

# Object files
*.o
*.ko
*.obj
*.elf

# Linker output
*.ilk
*.map
*.exp

# Precompiled Headers
*.gch
*.pch

# Libraries
*.lib
*.a
*.la
*.lo

# Shared objects (inc. Windows DLLs)
*.dll
*.so
*.so.*
*.dylib

# Executables
*.exe
*.out
*.app
*.i*86
*.x86_64
*.hex
main

# Debug files
*.dSYM/
*.su
*.idb
*.pdb

# Kernel Module Compile Results
*.mod*
*.cmd
.tmp_versions/
modules.order
Module.symvers
Mkfile.old
dkms.conf
  • echo
echo "# Result\xa\xa\x60\x60\x60\xa\xa\x60\x60\x60" >> README.md &&

echo "# macOS general" >> .gitignore &&
echo ".DS_Store\xa" >> .gitignore &&

echo "# Prerequisites" >> .gitignore &&
echo "*.d\xa" >> .gitignore &&

echo "# Object files" >> .gitignore &&
echo "*.o" >> .gitignore &&
echo "*.ko" >> .gitignore &&
echo "*.obj" >> .gitignore &&
echo "*.elf\xa" >> .gitignore &&

echo "# Linker output" >> .gitignore &&
echo "*.ilk" >> .gitignore &&
echo "*.map" >> .gitignore &&
echo "*.exp\xa" >> .gitignore &&

echo "# Precompiled Headers" >> .gitignore &&
echo "*.gch" >> .gitignore &&
echo "*.pch\xa" >> .gitignore &&

echo "# Libraries" >> .gitignore &&
echo "*.lib" >> .gitignore &&
echo "*.a" >> .gitignore &&
echo "*.la" >> .gitignore &&
echo "*.lo\xa" >> .gitignore &&

echo "# Shared objects (inc. Windows DLLs)" >> .gitignore &&
echo "*.dll" >> .gitignore &&
echo "*.so" >> .gitignore &&
echo "*.so.*" >> .gitignore &&
echo "*.dylib\xa" >> .gitignore &&

echo "# Executables" >> .gitignore &&
echo "*.exe" >> .gitignore &&
echo "*.out" >> .gitignore &&
echo "*.app" >> .gitignore &&
echo "*.i*86" >> .gitignore &&
echo "*.x86_64" >> .gitignore &&
echo "*.hex" >> .gitignore &&
echo "main\xa" >> .gitignore &&

echo "# Debug files" >> .gitignore &&
echo "*.dSYM/" >> .gitignore &&
echo "*.su" >> .gitignore &&
echo "*.idb" >> .gitignore &&
echo "*.pdb\xa" >> .gitignore &&

echo "# Kernel Module Compile Results" >> .gitignore &&
echo "*.mod*" >> .gitignore &&
echo "*.cmd" >> .gitignore &&
echo ".tmp_versions/" >> .gitignore &&
echo "modules.order" >> .gitignore &&
echo "Module.symvers" >> .gitignore &&
echo "Mkfile.old" >> .gitignore &&
echo "dkms.conf" >> .gitignore


Zig .gitignore[๐Ÿ”]

echo "# Result\xa\xa\x60\x60\x60\xa\xa\x60\x60\x60" >> README.md &&

echo "# A collection of useful .gitignore templates " >> .gitignore &&
echo "# https://github.com/github/gitignore\xa" >> .gitignore &&
echo "# This file is for zig-specific build artifacts." >> .gitignore &&
echo "# If you have OS-specific or editor-specific files to ignore,\xa# such as *.swp or .DS_Store, put those in your global" >> .gitignore &&
echo "# General" >> .gitignore &&
echo ".DS_Store\xa" >> .gitignore &&

echo "# VS Code files for those working on multiple tools" >> .gitignore &&
echo ".vscode/\xa" >> .gitignore &&
echo "# Generated by zig build run" >> .gitignore  &&
echo "# will have compiled files and executables" >> .gitignore &&
echo "zig-out/" >> .gitignore &&
echo "zig-cache/" >> .gitignore &&
echo "/release/" >> .gitignore &&
echo "/debug/" >> .gitignore &&
echo "/build/" >> .gitignore &&
echo "/build-*/" >> .gitignore &&
echo "/docgen_tmp/\xa" >> .gitignore
# This file is for zig-specific build artifacts.
# If you have OS-specific or editor-specific files to ignore,
# such as *.swp or .DS_Store, put those in your global
.DS_Store
# VS Code files for those working on multiple tools
.vscode/
# ~/.gitignore and put this in your ~/.gitconfig:
#
# [core]
#     excludesfile = ~/.gitignore
#
# Cheers!
# -andrewrk

zig-cache/
zig-out/
/release/
/debug/
/build/
/build-*/
/docgen_tmp/

์ถœ์ฒ˜ https://github.com/ziglang/zig/blob/master/.gitignore

github/gitignore#3442


Java & Kotlin .gitignore[๐Ÿ”]

.gradle
**/build/
!src/**/build/

# Ignore Gradle GUI config
gradle-app.setting

# Avoid ignoring Gradle wrapper jar file (.jar files are usually ignored)
!gradle-wrapper.jar

# Avoid ignore Gradle wrappper properties
!gradle-wrapper.properties

# Cache of project
.gradletasknamecache

# Eclipse Gradle plugin generated files
# Eclipse Core
.project
# JDT-specific (Eclipse Java Development Tools)
.classpath

Java & Kotlin echo .gitignore

echo ".gradle" >> .gitignore &&
echo "**/build/" >> .gitignore &&
echo "\x21src/**/build/\xa" >> .gitignore &&

echo "# Ignore Gradle GUI config" >> .gitignore &&
echo "gradle-app.setting\xa" >> .gitignore &&

echo "# Avoid ignoring Gradle wrapper jar file (.jar files are usually ignored)" >> .gitignore &&
echo "\x21gradle-wrapper.jar\xa" >> .gitignore &&

echo "# Avoid ignore Gradle wrappper properties" >> .gitignore &&
echo "\x21gradle-wrapper.properties\xa" >> .gitignore &&

echo "# Cache of project" >> .gitignore &&
echo ".gradletasknamecache\xa" >> .gitignore &&

echo "# Eclipse Gradle plugin generated files" >> .gitignore &&
echo "# Eclipse Core" >> .gitignore &&
echo ".project" >> .gitignore &&
echo "# JDT-specific (Eclipse Java Development Tools)" >> .gitignore &&
echo ".classpath" >> .gitignore


TypeScript .gitignore[๐Ÿ”]

echo "node_modules/" >> .gitignore &&
echo ".DS_Store" >> .gitignore &&
echo "package-lock.lock" >> .gitignore &&
echo ".vscode/" >> .gitignore &&
echo "dist/" >> .gitignore &&
echo "pkg/" >> .gitignore &&
echo "build/" >> .gitignore

echo ์—์ฝ”(echo)๋กœ ์œ ๋‹ˆ์ฝ”๋“œ(Unicode) ์ถœ๋ ฅํ•˜๊ธฐ[๐Ÿ”]

echo $'\uf115'

Power10k Install[๐Ÿ”]

https://economiceco.tistory.com/m/16511

    1. sudo apt install zsh
$ sudo apt install zsh
    1. Nerd Font์„ค์น˜

https://github.com/romkatv/powerlevel10k#fonts

  • . ohmyzsh์„ค์น˜

https://ohmyz.sh/

https://ohmyz.sh/#install

sh -c "$(curl -fsSL https://raw.githubusercontent.com/ohmyzsh/ohmyzsh/master/tools/install.sh)"

ohmyzsh github https://github.com/ohmyzsh/ohmyzsh

    1. power10k์„ค์น˜

https://github.com/romkatv/powerlevel10k

    1. bashrc ์„ค์ • ์ตœ์ƒ๋‹จ์— ์ถ”๊ฐ€
exec zsh
    1. ํ„ฐ๋ฏธ๋„์—์„œ zsh ์น˜๋ฉด ์„ค์ •ํ™”๋ฉด ๋‚˜์˜ด .zshrc ์„ค์ • ๋๋‚ด๊ณ  Plugins ์ถ”๊ฐ€
# Which plugins would you like to load?
# Standard plugins can be found in $ZSH/plugins/
# Custom plugins may be added to $ZSH_CUSTOM/plugins/
# Example format: plugins=(rails git textmate ruby lighthouse)
# Add wisely, as too many plugins slow down shell startup.
plugins=(git
    # other plugins..
    zsh-syntax-highlighting
    zsh-autosuggestions
    z
    fzf # ํ•„์š”ํ•˜๋ฉด ์ถ”๊ฐ€ํ•˜์„ธ์š”
    fasd # ํ•„์š”ํ•˜๋ฉด ์ถ”๊ฐ€ํ•˜์„ธ์š”
)
    1. ์„ค์ • ๋๋‚ด๊ณ  Plugins ์ถ”๊ฐ€
cd .oh-my-zsh/plugins

pluginsํด๋” ๋“ค์–ด๊ฐ€์„œ

git clone ์œผ๋กœ ๊ฐ•์ œ๋กœ ๋„ฃ์–ด์ฃผ๊ธฐ

zsh-z https://github.com/agkozak/zsh-z

https://github.com/zsh-users/zsh-autosuggestions

https://github.com/zsh-users/zsh-syntax-highlighting

.zshrc ์—์„œ ํ•  ์˜ˆ์ •

# If you come from bash you might have to change your $PATH.
export PATH=$HOME/bin:/usr/local/bin:$PATH




๋์€ :$PATH๋กœ ๋๋‚ด๊ณ  ๊ทธ ์‚ฌ์ด์— ํด๋” ๋„ฃ๊ณ  : ์œผ๋กœ ๋ถ„๋ฆฌํ•œ๋‹ค.


๋‚ด ์„ค์ •
# If you come from bash you might have to change your $PATH.
export PATH=$HOME/bin:/usr/local/bin:$HOME/.cargo/bin:$HOME/.zig:$HOME/zls:$PATH:
    1. ๋‚ด๊ฐ€ ์„ธํŒ…ํ•œ PATHํ™•์ธ๋ฐฉ๋ฒ•
$PATH

https://github.com/YoungHaKim7/rust_vim_setting

dotfiles_linux/์ฐธ์กฐํ•˜์„ธ์š”



shell๋ช…๋ น์–ด ์ •๋ฆฌ์ž˜๋จ.commands.dev

https://www.commands.dev/


xxd ์‚ฌ์šฉ๋ฒ•

 xxd -I 0x00595335 rust_stop_watch_youtube_pomodoro_timer
Usage:
       xxd [options] [infile [outfile]]
    or
       xxd -r [-s [-]offset] [-c cols] [-ps] [infile [outfile]]
Options:
    -a          toggle autoskip: A single '*' replaces nul-lines. Default off.
    -b          binary digit dump (incompatible with -ps,-i). Default hex.
    -C          capitalize variable names in C include file style (-i).
    -c cols     format <cols> octets per line. Default 16 (-i: 12, -ps: 30).
    -E          show characters in EBCDIC. Default ASCII.
    -e          little-endian dump (incompatible with -ps,-i,-r).
    -g bytes    number of octets per group in normal output. Default 2 (-e: 4).
    -h          print this summary.
    -i          output in C include file style.
    -l len      stop after <len> octets.
    -n name     set the variable name used in C include output (-i).
    -o off      add <off> to the displayed file position.
    -ps         output in postscript plain hexdump style.
    -r          reverse operation: convert (or patch) hexdump into binary.
    -r -s off   revert with <off> added to file positions found in hexdump.
    -d          show offset in decimal instead of hex.
    -s [+][-]seek  start at <seek> bytes abs. (or +: rel.) infile offset.
    -u          use upper case hex letters.
    -R when     colorize the output; <when> can be 'always', 'auto' or 'never'. Default: 'auto'.
    -v          show version: "xxd 2023-10-25 by Juergen Weigert et al.".
  • xxd -l ์ฒซ์ค„ ๋ถ€ํ„ฐ
 xxd -l 200 rust_stop_watch_youtube_pomodoro_timer
00000000: cffa edfe 0c00 0001 0000 0000 0200 0000  ................
00000010: 1300 0000 7007 0000 8500 a000 0000 0000  ....p...........
00000020: 1900 0000 4800 0000 5f5f 5041 4745 5a45  ....H...__PAGEZE
00000030: 524f 0000 0000 0000 0000 0000 0000 0000  RO..............
00000040: 0000 0000 0100 0000 0000 0000 0000 0000  ................
00000050: 0000 0000 0000 0000 0000 0000 0000 0000  ................
00000060: 0000 0000 0000 0000 1900 0000 2802 0000  ............(...
00000070: 5f5f 5445 5854 0000 0000 0000 0000 0000  __TEXT..........
00000080: 0000 0000 0100 0000 0040 2f00 0000 0000  .........@/.....
00000090: 0000 0000 0000 0000 0040 2f00 0000 0000  .........@/.....
000000a0: 0500 0000 0500 0000 0600 0000 0000 0000  ................
000000b0: 5f5f 7465 7874 0000 0000 0000 0000 0000  __text..........
000000c0: 5f5f 5445 5854 0000                      __TEXT..
  • ๋‚ด๊ฐ€ ํ‘œ์‹œํ•œ๊ณณ๋ถ€ํ„ฐ ๋๊นŒ์ง€ ์ถœ๋ ฅ ํ• ๋•Œ
    • xxd -s
 xxd -s 0x00595335 rust_stop_watch_youtube_pomodoro_timer
00595335: 41b1 d9db a764 19c9 a3ee e788 1920 9b8d  A....d....... ..
00595345: e0cb 62df 151e f065 63c0 fbcd 6c4e 7922  ..b....ec...lNy"
00595355: 2af5 38b7 1031 d2f9 3c50 c2bc ca07 9596  *.8..1..<P......
00595365: 49c0 e4ee 6ce3 026d 609d f1f8 a3cf e03b  I...l..m`......;
00595375: 1cf0 dbac 7ea0 4b77 dee4 51d6 f6a6 e1a3  ....~.Kw..Q.....
00595385: a3ea 4b8e b93e 20c4 f2d5 f0de 900a d38b  ..K..> .........
00595395: bd80 b4ad 8a6a aa0c 1a89 cae1 a61e ad17  .....j..........
005953a5: 89e0 10a5 bf2c 4ee3 43aa d5ae 51a0 1e27  .....,N.C...Q..'
005953b5: 11c1 47ed 68ea c238 a2db 1be5 534b d583  ..G.h..8....SK..
005953c5: b163 a273 fad6 4664 69fe 9b48 fa14 f69e  .c.s..Fdi..H....
005953d5: 00db 573e c9e2 0a42 403c 1f53 a807 a479  ..W>...B@<.S...y
005953e5: 25c7 25d1 9a3d 7c4e b28d ae16 7e7e 7f00  %.%..=|N....~~..
005953f5: 0000 00  
  • ๋‚ด๊ฐ€ ์›ํ•˜๋Š” ๋ผ์ธ tail๊ณผ headํ™œ์šฉ
$ xxd -s 0x00595335 rust_stop_watch_youtube_pomodoro_timer | head -n 5
00595335: 41b1 d9db a764 19c9 a3ee e788 1920 9b8d  A....d....... ..
00595345: e0cb 62df 151e f065 63c0 fbcd 6c4e 7922  ..b....ec...lNy"
00595355: 2af5 38b7 1031 d2f9 3c50 c2bc ca07 9596  *.8..1..<P......
00595365: 49c0 e4ee 6ce3 026d 609d f1f8 a3cf e03b  I...l..m`......;
00595375: 1cf0 dbac 7ea0 4b77 dee4 51d6 f6a6 e1a3  ....~.Kw..Q.....


$ xxd -s 0x00595335 rust_stop_watch_youtube_pomodoro_timer | tail -n 3
005953d5: 00db 573e c9e2 0a42 403c 1f53 a807 a479  ..W>...B@<.S...y
005953e5: 25c7 25d1 9a3d 7c4e b28d ae16 7e7e 7f00  %.%..=|N....~~..
005953f5: 0000 00 

Regular Expression

https://www.regexpal.com/

Shell_Script

ASCII Table(16์ง„์ˆ˜๋กœ ์™ธ์šฐ์ž)

์ฃผ๋กœ ์“ฐ๋Š” ascii & Unicode ์ •๋ฆฌ
charโœจ Escape 16์ง„์ˆ˜Hx ์„ค๋ช…Description 10์ง„์ˆ˜Dec 8์ง„์ˆ˜Oct 2์ง„์ˆ˜Binary In Unicode
LF \xa 0xA NL line feed, new line 10 0o12 0b1010
Space \x20 0x20 Space 32 0o40 0b00100000
! \x21 0x21 Exclamation mark 33 0o41 0b00100001
` \x60 0x60 Backtic, Grave 96 0o140 0b1100000 U+0060
`
GRAVE ACCENT


SILQ Unicode

https://github.com/YoungHaKim7/silq_project

์–‘์ž ์ฝ”๋”ฉ ์ž์ฃผ ์“ฐ๋Š” Unicode
Symbol Unicode(Hex) LaTeX ShortCut Name 10์ง„์ˆ˜Dec
โ†’ 2192 \to Rightwards Arrow 8594
โ„• 2115 \bn Double-Struck Capital N 8469
โ„ 211D \br Double-Struck Capital R 8477
ฯ€ 3A0 \pi Greek Capital Letter Pi 928
๐”น 1D539 \bb Mathematical Double-Struck Capital B 120121
โ‹… 22C5 \cdot Dot Operator 8901
ฮธ 398 \theta Greek Capital Letter Theta 920
ฯˆ 3A8 \psi Greek Capital Letter PSI 936
ฮป 39B \lambda Greek Capital Letter LAMDA 923
ยฌ AC \neg Not Sign 172
ร— D7 \times Multiplication Sign 215
ยฑ B1 \pm Plus-Minus Sign 177
๐Ÿ™ 1D7D9 \b1 Mathematical Double-Struck Digit One 120793

Memory 2, 8 , 16 pattern

Binary vs Octal vs Decimal vs Hexadecimal
16์ง„์ˆ˜Hx ์„ค๋ช…Description 10์ง„์ˆ˜Dec 8์ง„์ˆ˜Oct 2์ง„์ˆ˜Binary
0xff 255 0o377 0b11111111