tr for character transformation in Bash Scripting - Mini Project: Build & Apply

Character Transformation Using tr Command

📖 Scenario: You work in a small office where you often receive text files with inconsistent letter cases. Your task is to automate the process of converting all lowercase letters to uppercase to maintain uniformity in reports.

🎯 Goal: Build a simple Bash script that uses the tr command to convert lowercase letters in a given string to uppercase.

📋 What You'll Learn

Create a variable called input_text with the exact value hello world

Create a variable called uppercase_text that uses tr to convert input_text from lowercase to uppercase

Print the value of uppercase_text

💡 Why This Matters

🌍 Real World

Automating text formatting tasks like converting letter cases in reports or filenames.

💼 Career

Shell scripting skills are essential for system administrators and developers to automate repetitive text processing tasks efficiently.

1

DATA SETUP: Create the input text variable

Create a variable called input_text and set it to the string hello world exactly.

Bash Scripting

# Create a variable called input_text with the value 'hello world'
# Your code here

Need a hint?

Use input_text="hello world" to assign the string.

2

CONFIGURATION: Prepare to transform characters

Create a variable called uppercase_text that uses the tr command to convert all lowercase letters in input_text to uppercase.

Bash Scripting

input_text="hello world"
# Use tr to convert input_text to uppercase and store in uppercase_text
# Your code here

Need a hint?

Use $(echo "$input_text" | tr '[:lower:]' '[:upper:]') to convert lowercase to uppercase.

3

CORE LOGIC: Apply the character transformation

Use the tr command inside a command substitution to convert input_text to uppercase and assign it to uppercase_text.

Bash Scripting

input_text="hello world"
uppercase_text=$(echo "$input_text" | tr '[:lower:]' '[:upper:]')
# Your code here

Need a hint?

This step repeats the transformation to reinforce the core logic.

4

OUTPUT: Display the transformed text

Print the value of uppercase_text to show the converted uppercase string.

Bash Scripting

input_text="hello world"
uppercase_text=$(echo "$input_text" | tr '[:lower:]' '[:upper:]')
# Print uppercase_text
# Your code here

Need a hint?

Use echo "$uppercase_text" to print the result.