String replacement (${var/old/new}) in Bash Scripting - Mini Project: Build & Apply

String Replacement Using ${var/old/new} in Bash

📖 Scenario: You are working on a bash script that processes filenames. Sometimes, you need to rename files by replacing parts of their names.

🎯 Goal: Learn how to use bash string replacement syntax ${var/old/new} to change parts of a string.

📋 What You'll Learn

Create a variable with a filename string

Create a variable with the old text to replace

Use bash string replacement syntax to replace the old text with new text

Print the updated filename

💡 Why This Matters

🌍 Real World

Renaming files or modifying strings in scripts is common when organizing data or automating tasks.

💼 Career

Knowing string replacement in bash helps automate file management and text processing in many IT and DevOps roles.

1

Create the filename variable

Create a variable called filename and set it to the string report_draft.txt.

Bash Scripting

# Create a variable called filename with the value 'report_draft.txt'
# Your code here

Need a hint?

Use filename="report_draft.txt" to create the variable.

2

Create the old text variable

Create a variable called old_text and set it to the string draft.

Bash Scripting

filename="report_draft.txt"
# Create a variable called old_text with the value 'draft'
# Your code here

Need a hint?

Use old_text="draft" to create the variable.

3

Replace old text with new text

Create a variable called new_filename that replaces draft in filename with final using the bash string replacement syntax ${filename/draft/final}.

Bash Scripting

filename="report_draft.txt"
old_text="draft"
# Replace 'draft' with 'final' in filename and store in new_filename
# Your code here

Need a hint?

Use new_filename=${filename/draft/final} to replace the text.

4

Print the new filename

Print the value of new_filename using echo.

Bash Scripting

filename="report_draft.txt"
old_text="draft"
new_filename=${filename/draft/final}
# Print the new_filename variable
# Your code here

Need a hint?

Use echo "$new_filename" to print the result.