Day 9 task — on day 9, the task is to create a directory Back-up with rotation.
Objective
The objective of day 9 is to write a bash script that can back up a directory and retain only the 3 most recent backups, automatically deleting older ones. This is useful for automating backup tasks while managing disk space efficiently.
🔹 Step 1: Open your Terminal
🔹Step 2: Create a New Bash Script File
In your terminal
nano backup_with_rotation.sh
🔹 Step 3: Paste the Script
Copy and paste this into the terminal window:
#!/bin/bash
# Description:
# This script backs up a directory by creating a timestamped backup folder
# and implements a rotation mechanism to retain only the last 3 backups.
if [ -z "$1" ]; then
echo "Usage: $0 /path/to/target_directory"
exit 1
fi
TARGET_DIR="$1"
if [ ! -d "$TARGET_DIR" ]; then
echo "Error: Directory does not exist: $TARGET_DIR"
exit 1
fi
TIMESTAMP=$(date +"%Y-%m-%d_%H-%M-%S")
BACKUP_NAME="backup_$TIMESTAMP"
BACKUP_PATH="$TARGET_DIR/$BACKUP_NAME"
mkdir "$BACKUP_PATH"
cp -r "$TARGET_DIR"/* "$BACKUP_PATH" 2>/dev/null
echo "Backup created: $BACKUP_PATH"
cd "$TARGET_DIR"
BACKUPS=$(ls -dt backup_* 2>/dev/null)
NUM_BACKUPS=$(echo "$BACKUPS" | wc -l)
if [ "$NUM_BACKUPS" -gt 3 ]; then
TO_DELETE=$(echo "$BACKUPS" | tail -n +4)
echo "$TO_DELETE" | xargs rm -rf
echo "Old backups removed. Only the latest 3 are retained."
fi
Save and exit the text editor.
🔹 Step 4: Make the Script Executable
chmod +x backup_with_rotation.sh
🔹 Step 5: Create a Test Directory:
mkdir test_dir
touch test_dir/file{1..5}.txt
🔹 Step 6: Run the Script
./backup_with_rotation.sh ./test_dir
output:
Backup created: ./test_dir/backup_YYYY-MM-DD_HH-MM-SS
Run multiple times to see the backup rotation in effect.
🔹 Step 7. Create a GitHub Repository
Go to https://github.com/new.
- Name the Repository - 90DaysOfDevOps-Day9
Choose:
Public or Private
Don't initialize with a README.
Click "Create repository"
🔹 Step 8. Clone the Repository
back in your IDE
git clone https://github.com/your-username/90DaysOfDevOps-Day9.git
cd 90DaysOfDevOps-Day9
🔹 Step9. Move Your Script into the Repo Folder
If your script is outside the cloned folder:
mv ../backup_with_rotation.sh .
🔹 Step 10. Initialize Git
If you didn’t clone, but are working in a folder you want to turn into a repo:
git init
git remote add origin https://github.com/your-username/90DaysOfDevOps-Day9.git
🔹 Step 11. Add and Commit
git add backup_with_rotation.sh
git commit -m "Add Day 9 backup with rotation script"
🔹 Step 7. Push to GitHub
git push origin main
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