My submission for 7 days of bash blaze challenge : Name - Yashraj Jaiswal

Challenges/Day_1/solution_day1_script.sh

@@ -1,31 +1,44 @@
 #!/bin/bash
+# Author: Yashraj Jaiswal
+# Date: 01-08-2023
+# Description: #TWSBashBlazeChallenge Day - 1
 
-# First line of the script is the shebang which tells the system how to execute
+# Task 1: Comments
+# - Comments are lines in a script that are ignored by the interpreter and help us describe the script.
 
-# Task  2: Echo
-echo "Scripting is fun with @TWS"
+# Task 2 : echo
+echo "Today is Day 1 of #TWSBashBlazeChallenge an amazing bash scripting challenge"
 
-# Task  3: Variables
-variable1="Hello"
-variable2="Bash"
+# Task 3: Variables
 
-# Task  4: Using Variables
-greeting="$variable1, $variable2!"
-echo "$greeting Welcome to the world of Bash scripting!"
+# declaring and initializing variables
+name = "Yashraj Jaiswal"
+interests = "web dev | devops"
 
-# Task  5: Using Built-in Variables
-echo "My current bash path - $BASH"
-echo "Bash version I am using - $BASH_VERSION"
-echo "PID of bash I am running - $$"
-echo "My home directory - $HOME"
-echo "Where am I currently? - $PWD"
-echo "My hostname - $HOSTNAME"
+# Task 4: Using Variables
 
-# Task  6: Wildcards
-echo "Files with .txt extension in the current directory:"
-ls *.txt
+echo "Hello, my name is $name and I am interesed in $interests"
 
+# Task 5: Using Built-in Variables
+#use built-in variables from bash to print useful information
 
+# print the host name
+echo "Hostname: $HOSTNAME"
+
+# print the current user
+echo "Current user: $USER"
+
+# print the current working directory
+echo "Current directory: $PWD"
+
+# Task 6: Wildcards
+
+# using * wild card to search for files ending in .txt
+ls -al *.txt
+
+# using ? wild card to search for files names ending with a single unknown character
+ls -al file?.txt
+
+# using [] wild card to search for files that start with 'file' and have numbers 0-5
+ls -al 'file[0-5]'.txt
 
-#Make sure to provide execution permission with the following command:
-#chmod +x day1_script.sh

Challenges/Day_2/backup_with_rotation.sh

@@ -1,41 +1,49 @@
 #!/bin/bash
-
-# Function to display usage information and available options
-function display_usage {
-    echo "Usage: $0 /path/to/source_directory"
-}
-
-# Check if a valid directory path is provided as a command-line argument
-if [ $# -eq 0 ] || [ ! -d "$1" ]; then
-    echo "Error: Please provide a valid directory path as a command-line argument."
-    display_usage
+# Author: Yashraj Jaiswal
+# Date: 01/08/2023
+# Description: TWSBashBlazeChallenge Day-2
+# Task 2: Directory Backup with Rotation
+
+# Validate input parameter for the directory to backup
+if [ "$#" -ne 1 ];
+then
+    echo "Usage: $0 <path_to_directory>"
+    echo "Hint: enter the full path to the directory to backup"
     exit 1
 fi
 
-# Directory path of the source directory to be backed up
-source_dir="$1"
-
-# Function to create a timestamped backup folder
-function create_backup {
-    local timestamp=$(date '+%Y-%m-%d_%H-%M-%S')  # Get the current timestamp
-    local backup_dir="${source_dir}/backup_${timestamp}"
-
-    # Create the backup folder with the timestamped name
-    mkdir "$backup_dir"
-    echo "Backup created successfully: $backup_dir"
-}
-
-# Function to perform the rotation and keep only the last 3 backups
-function perform_rotation {
-    local backups=($(ls -t "${source_dir}/backup_"* 2>/dev/null))  # List existing backups sorted by timestamp
-
-    # Check if there are more than 3 backups
-    if [ "${#backups[@]}" -gt 3 ]; then
-        local backups_to_remove="${backups[@]:3}"  # Get backups beyond the last 3
-        rm -rf "${backups_to_remove[@]}"  # Remove the oldest backups
-    fi
-}
+path_to_dir="$1"
+backup_dir="/var/backups"
+max_backup_files=3
+
+# Get the number of existing backup files in the backup directory
+total_backup_files=$(find "$backup_dir" -type f -name "*.tgz" | wc -l)
+echo
+echo "Total backup files: $total_backup_files"
+
+# Check if more than the allowed number of backup files exist
+if (( total_backup_files >= max_backup_files ));
+then
+    echo
+    echo "More than $max_backup_files backup files detected"
+    # Sort the backup files by modification time and delete the oldest one
+    oldest_file=$(find "$backup_dir" -type f -name "*.tgz" | sort -r | tail -n 1)
+    echo "Deleting the oldest backup file - $oldest_file"
+    sudo rm -f "$oldest_file"
+fi
 
-# Main script logic
-create_backup
-perform_rotation
+# Create a new tar file with timestamp in the filename
+backup_file="backup_$(date +%d_%m_%Y_%H_%M_%S).tgz"
+sudo tar -cvzf "$backup_dir/$backup_file" "$path_to_dir" > /dev/null 2>&1
+
+# Check if the tar command executed successfully
+if [[ $? -eq 0 ]];
+then
+    echo
+    echo "Backup created successfully"
+    echo "List of backups created in the past 3 days:"
+    sudo ls -lh "$backup_dir"/*.tgz |  awk '{print "-",$NF, "\t(", $5, ")"}'
+else
+    echo "Unable to create backup"
+fi
+echo

Challenges/Day_2/explorer.sh

@@ -1,23 +1,31 @@
 #!/bin/bash
+#Author: Yashraj Jaiswal
+# Date: 02/08/2023
+# Description: #TWSBashBlazeChallenge Day-2
+# Task 1: Interactive File and Directory Explorer
 
-# Part 1: File and Directory Exploration
-echo "Welcome to the Interactive File and Directory Explorer!"
+# print a welcome message for the user
+echo Welcome to the Interactive File and Directory Explorer!
+# Format and display files and directories with their size in human readable format
+echo "Files and Directories in current path - $PWD"
+ls -lh | sed 1d | awk '{print "- ",$NF,"\t","(",$5,")"}'
 
-while true; do
-    # List all files and directories in the current path
-    echo "Files and Directories in the Current Path:"
-    ls -lh
-
-    # Part 2: Character Counting
-    read -p "Enter a line of text (Press Enter without text to exit): " input
-
-    # Exit if the user enters an empty string
-    if [ -z "$input" ]; then
-        echo "Exiting the Interactive Explorer. Goodbye!"
-        break
+# Infinite loop to continiously take user input
+while true;
+do
+    # prompt user to enter a text
+    echo -n "Enter a line of text (Press Enter without text to exit)"
+    read input
+    # use -z option to test for empty string
+    if [[ -z $input ]];
+    then
+        echo Exiting the interactive explorer. Goodbye!
+        exit
+    else
+        # bash built-in string length
+        input_length=${#input}
+        # print the character count on screen
+        echo "Character count $input_length"
     fi
-
-    # Calculate and print the character count for the input line
-    char_count=$(echo -n "$input" | wc -m)
-    echo "Character Count: $char_count"
 done
+