Linux Applications

🐧 Linux Applications – Reviewer

I. Why Text Editors Are Important in Linux

This part is important kasi ito ‘yung foundation ng topic. Linux is very text-based. Hindi siya puro click-click like Windows.

📌 Reasons for Using Text Editors in Linux

• Scripts are written in text editors

  • Example: If you’re creating a shell script (.sh) to automate tasks, you write it in a text editor.

  • Real-life: Parang Google Docs mo for coding.

• Linux programs use text-based data files

  • Many programs read plain text files for input.

  • Example: A configuration file that tells a server how to behave.

• System services use text-based configuration files

  • Most Linux services (like network settings) are controlled by editing text files.

  • Meaning: If marunong ka mag-edit ng text file, may power ka sa system 👀

🔥 Quick Summary

Linux = text-driven system
If you know text editors → you control Linux.

Memory Trick:
S-C-C = Scripts, Config, Control

II. Common Text-Based Editors in Linux

Let’s compare the popular ones.

🧠 emacs

• Customizable and extendable

• Can work like IDE (Java, C, etc.)

• Needs installation first

Think of it as: Linux version of VS Code (but more old school).

🧠 nano

• Designed for beginners

• Easy to use

• Commands shown at the bottom

Perfect if you’re just starting.

🧠 gedit

• Works only in GUI

• Comes with GNOME desktop

• More like Notepad

If walang GUI? Hindi siya tatakbo.

🧠 vi (or vim – vi improved)

• Found in almost all Linux systems

• Very powerful

• Uses modes

This one? Medyo intimidating at first. Pero once you master it, ang bilis mo na mag-edit.

🔥 Quick Summary

• Beginner → nano

• GUI lover → gedit

• Advanced power user → vi/vim

• Customization beast → emacs

Memory Trick:
NEGV
Nano – Easy
Emacs – Giant
Gedit – Visual
Vi – Veteran

III. The 3 Modes of vi Editor

Ito ‘yung pinaka-importante.

vi is NOT like normal editors. It works in modes.

1⃣ Command Mode

Default mode when you open vi.

• Keys = commands

• Hindi ka pa nagta-type ng text

Example:
Press dd → deletes line
Press yy → copies line

2⃣ Insert Mode

• Press i

• Now you can type text

To exit insert mode:
👉 Press Esc

3⃣ Replace Mode

• Replaces characters instead of inserting

• Overwrites text

🧠 Real-Life Analogy

Think of vi like:

• Command Mode = Remote control

• Insert Mode = Typing mode

• Replace Mode = Correction pen

🔥 Quick Summary

Open vi → Default is Command Mode
Press i → Insert Mode
Press Esc → Back to Command

Memory Trick:
ICE
Insert → Command → Escape

IV. Basic vi Commands

🧭 Cursor Movement Commands

🧠 Trick to Remember Movement

The keys h j k l form an arrow shape on keyboard.

h ←
j ↓
k ↑
l →

Classic hacker movement setup 😎

✍ Inserting & Appending

• i → Insert at cursor

• A → Append at end of line

• o → Insert new line below

• O → Insert new line above

Real-life:

• o = open below

• O = open above

❌ Text Deletion Commands

🧠 Pattern Recognition

If you notice:

• d = delete

• y = yank (copy)

• Number before command = multiplier

So:

• 5dd = delete 5 lines

• 3x = delete 3 characters

📋 Yanking (Copying) Commands

Think:
y = yank = copy
d = delete

🔥 Quick Summary for Editing

• d = delete

• y = copy

• p = paste (common vim command)

• Number before = multiply action

Memory Trick:
“DY = Destroy or Yoink”

V. Productivity Software in Linux

Linux is not just terminal ha. May productivity apps din.

LibreOffice – Linux Office Suite

Includes:

📝 Writer

• Like MS Word

• Has AutoComplete

• Suggests words

📊 Calc

• Like Excel

• Advanced DataPilot

• Real-time data integration

Perfect for data analysis.

🎤 Impress

• Like PowerPoint

• Fontworks (2D & 3D text)

• Presenter Console (see notes, timer, next slide)

🎨 Draw

• For diagrams, flowcharts

• Can create 3D objects

• Good for technical drawings

🗄 Base

• Database software

• Supports:

  • MySQL/MariaDB

  • MS Access

  • PostgreSQL

🧮 Math

• For inserting formulas

• Good for scientific docs

🔥 Quick Summary

LibreOffice = Complete office suite for Linux.

Memory Trick:
W-C-I-D-B-M
Writer
Calc
Impress
Draw
Base
Math

VI. GIMP

Recommended image editor for Linux.

Features:

• Customizable Interface

• Photo Enhancement

• Digital Retouching

• Hardware Support

Think:
Linux version of Photoshop (free version vibes).

🔥 FINAL RECAP (Exam Weapon Mode)

1⃣ Linux relies heavily on text editors

Scripts + config files = text-based.

2⃣ Editors

nano → beginner
gedit → GUI
emacs → customizable
vi/vim → powerful default

3⃣ vi Modes

Command
Insert
Replace

4⃣ Important vi Commands

• h j k l → movement

• dd → delete line

• yy → copy line

• d$ → delete to end

• number + command → multiplier

5⃣ LibreOffice Tools

Writer, Calc, Impress, Draw, Base, Math

6⃣ GIMP

Linux image editor

🧠 Ultimate Memory Trick

Think of Linux as:

“Text first, GUI second.”

Then remember:

VIM RULES

• V – Various modes

• I – Insert with i

• M – Multiply commands