Bash Commands Cheat Sheet ✨

Basic Commands

Displaying Output:

• Echo a calculation result:

    num1=4
    num2=5
    echo $((num1+num2))   # Prints: 9
    echo 'end'            # Prints: end
  

  🔗 Tip: echo is great for printing text or results in the terminal!

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Get the Current Directory:

• Print working directory:

    pwd
  

  🔐 Displays the current location in the filesystem.

Check Current User:

• Who am I?

    whoami
  

  👤 Shows the username of the logged-in user.

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Listing Directory Contents 🔍

See All Files and Folders:

• Basic listing:

    ls
  

• Show hidden files and folders:

    ls -a
  

• Show permissions of contents:

    ls -la
  

  ⚡ Pro Tip: Permissions include read (r), write (w), and execute (x).

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File and Folder Operations 📁

Create Files:

• Using touch command:

    touch script.js script1.js script2.js script3.js
  

Create Folders:

• Using mkdir command:

    mkdir src
  

Copy Files:

• Copy a file into a folder:

    cp fileNameToCopy folderNameToPaste
  

Move Files:

• Move a file to another folder:

    mv fileNameToCopy folderNameToPaste
  

Rename Files:

• Move and rename a file:

    mv fileNameToMoveOrRename newFileName
  

Delete Files and Folders:

• Delete a file:

    rm fileName
  

• Delete an empty folder:

    rmdir folderAddress
  

• Delete a folder with contents:

    rm -r folderAddress  # -r means recursive
  

  ⚡ Pro Tip: Use with caution as this permanently deletes files!

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For Loops in Bash 🔄

Create Multiple Files:

• 100 JavaScript files:

    for i in {1..100}; do touch "app$i.js"; done
  

Delete Multiple Files:

• Remove those 100 files:

    for i in {1..100}; do rm "app$i.js"; done
  

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Viewing and Editing Files 🔧

View File Data:

• Using cat command:

    cat fileName
  

  ✨ Note: cat means concatenate and is used to display file content.

Edit File Data:

• Using nano editor:

    nano fileName
  

• Using vim editor:

    vim fileName
  

  ⚡ Pro Tip: To save in vim, press ESC then type :wq to write and quit.

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Summary

This cheat sheet gives you a quick and interactive guide to essential bash commands. From managing files 📂 to looping 🔄 and editing content 🔧, bash scripting makes automating tasks fun and efficient!

Happy Coding 🚀