Backup automation script in Bash Scripting - Step-by-Step Execution

Concept Flow - Backup automation script

Start Script

↓

Check Source Folder Exists

Yes↓

Create Backup Folder if Missing

↓

Copy Files from Source to Backup

↓

Confirm Backup Success

↓

End Script

The script starts by checking the source folder, creates backup folder if needed, copies files, then confirms success before ending.

Execution Sample

Bash Scripting

#!/bin/bash
SRC="/home/user/docs"
DEST="/home/user/backup"
if [ -d "$SRC" ]; then
    mkdir -p "$DEST"
    cp -r "$SRC"/* "$DEST"
    if [ $? -eq 0 ]; then
        echo "Backup success"
    fi
fi

This script checks if the source folder exists. If it does, it creates the backup folder if missing, copies all files recursively from the source to the backup folder, and confirms success by checking the exit status.

Execution Table

Step	Action	Condition/Evaluation	Result/Output
1	Check if source folder exists	[ -d /home/user/docs ]	True, proceed
2	Create backup folder if missing	mkdir -p /home/user/backup	Backup folder ready
3	Copy files from source to backup	cp -r /home/user/docs/* /home/user/backup	Files copied
4	Check copy success	$? -eq 0	Success message printed
5	End script	N/A	Script ends

💡 Script ends after copying files and confirming success

Variable Tracker

Variable	Start	After Step 2	After Step 3	Final
SRC	/home/user/docs	/home/user/docs	/home/user/docs	/home/user/docs
DEST	/home/user/backup	/home/user/backup	/home/user/backup	/home/user/backup

Key Moments - 3 Insights

Why do we use mkdir -p before copying files?

mkdir -p ensures the backup folder exists before copying. Without it, copying would fail if the folder is missing (see Step 2 in execution_table).

What happens if the source folder does not exist?

The script checks if the source folder exists at Step 1. If it doesn't, the script should stop or handle the error to avoid copying from a missing folder.

How do we know if the copy was successful?

After copying, the script checks the exit status $? at Step 4. A zero means success, so it prints a success message.

Visual Quiz - 3 Questions

Look at the execution table, what is the result of Step 2?

A Files copied

B Backup folder ready

C Source folder missing

D Script ends

💡 Hint

Check the 'Result/Output' column for Step 2 in the execution_table

At which step does the script confirm the copy was successful?

A Step 4

B Step 3

C Step 1

D Step 5

💡 Hint

Look for the step checking exit status $? in the execution_table

If the source folder did not exist, what would happen at Step 1?

A Condition is True, proceed

B Backup folder is created

C Condition is False, script should stop

D Files are copied anyway

💡 Hint

Refer to the Condition/Evaluation column for Step 1 in the execution_table

Concept Snapshot

Backup automation script in bash:
- Define source (SRC) and destination (DEST) folders
- Use mkdir -p to create backup folder if missing
- Copy files with cp -r from SRC to DEST
- Check copy success with exit status ($?)
- Script ends after confirming backup

Full Transcript

This backup automation script starts by checking if the source folder exists. If it does, it creates the backup folder if missing using mkdir -p. Then it copies all files from the source to the backup folder using cp -r. After copying, it checks if the copy was successful by examining the exit status. Finally, the script ends. Variables SRC and DEST hold the folder paths and remain constant. Key points include ensuring the backup folder exists before copying and checking the copy success to avoid silent failures.