codex-lv2-may-2025

Shell Snippets

🐚 Shell Commands Cheat Sheet for Shell Novices

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📁 Navigating the Filesystem

Command	Purpose
pwd	Show current directory path
ls	List files and directories in the current directory
ls -F	List files and directories, marking directories with /
ls -a	Show all files, including hidden ones
cd <directory>	Change directory
cd ..	Move up one directory level
cd	Move to home directory

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📦 Creating and Manipulating Files and Directories

Command	Purpose
mkdir <directory>	Make a new directory
rmdir <directory>	Remove an empty directory
touch <filename>	Create a new empty file
cp <src> <dest>	Copy a file
mv <src> <dest>	Move or rename a file
rm <filename>	Remove (delete) a file

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📜 Examining Files

Command	Purpose
cat <filename>	View the entire contents of a file
less <filename>	View file page by page (scrollable)
head <filename>	View first 10 lines of a file
tail <filename>	View last 10 lines of a file

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✏️ Editing Files

Command	Purpose
nano <filename>	Open file in Nano text editor

• Nano is a simple, beginner-friendly text editor in the terminal.
• More commands cheat sheet
• Example:

nano notes.txt

• Controls:

  • Ctrl + O : Save
  • Ctrl + X : Exit
  • Ctrl + K : Cut
  • Ctrl + U : Paste

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🔍 Searching Inside Files

Command	Purpose
grep "text" <filename>	Search for text inside a file
wc <filename>	Count lines, words, characters in a file

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🔗 Working with Paths

Symbol	Meaning
.	Current directory
..	Parent directory
~	Home directory

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🛠 Other Useful Commands

Command	Purpose
history	Show command history
clear	Clear the terminal screen
echo "text"	Print text to the terminal
man <command>	Show manual page for a command