Day 6 submission

Challenges/Day_1/my_solution_day1.sh

@@ -0,0 +1,44 @@
+#!bin/bash/
+
+#task1- comments
+#this is BashBlazeChallenge- Day1
+
+#task2- echo
+#echo prints on the screen
+echo "This is BashBlazeChallenge- Day1"
+
+#task3 - variables
+name="Shivani"
+yeo=2
+
+#task4- using variables
+echo "My name is $name and YEO is $yeo"
+
+a=13 b=89
+sum=$(($a+$b))
+echo "The sum of $a and $b is $sum"
+
+#task5 - using built-in variables
+echo "My current working directory is $PWD"
+echo "My home directory is $HOME"
+echo "The PID of this bash process is $$"
+
+#task6 - using wildcards
+echo "making some files:"
+touch day{8..11}.txt
+touch hello.sh ls
+
+echo "Using wildcard- ls .sh"
+ls *.sh
+
+echo "Using wildcard- ls .txt"
+ls *.txt
+
+echo "Using ? wildcard- ls day?.txt"
+ls day?.txt
+
+echo "Using [] wildcard- ls day[1-10].txt"
+ls day[1-10].txt
+
+echo "Using ? wildcard- ls day*"
+ls day*

Challenges/Day_2/backup_with_rotation.sh

@@ -1,41 +1,20 @@
-#!/bin/bash
+#!bin/bash/
 
-# Function to display usage information and available options
-function display_usage {
-    echo "Usage: $0 /path/to/source_directory"
-}
+#we will take source path from user and gets stored in $1
+src_path=$1
 
-# Check if a valid directory path is provided as a command-line argument
-if [ $# -eq 0 ] || [ ! -d "$1" ]; then
-    echo "Error: Please provide a valid directory path as a command-line argument."
-    display_usage
-    exit 1
-fi
+#we will store the current date and time in 2 variables
+fname="$(date '+%Y-%m-%d')"
+time="$(date '+%I-%M-%S')"
 
-# Directory path of the source directory to be backed up
-source_dir="$1"
+#storing the name of the backup file in f_name
+f_name=backup_$fname"_"$time.tar.gz
 
-# 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}"
+#this line will zip the files present in $src_path
+tar -czf $f_name $src_path
 
-    # Create the backup folder with the timestamped name
-    mkdir "$backup_dir"
-    echo "Backup created successfully: $backup_dir"
-}
+echo "Backup Created: $PWD/$f_name"
 
-# 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
+#deleting the files except the 3 latest backup files
+rm -f $(ls -1t *.tar.gz | tail -n +4)
 
-    # 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
-}
-
-# Main script logic
-create_backup
-perform_rotation

Challenges/Day_2/explorer.sh

@@ -1,23 +1,22 @@
-#!/bin/bash
+#!bin/bash/
 
-# Part 1: File and Directory Exploration
 echo "Welcome to the Interactive File and Directory Explorer!"
 
-while true; do
-    # List all files and directories in the current path
-    echo "Files and Directories in the Current Path:"
-    ls -lh
+#ls -lh will give us the list of files and directories with their size in human readable format
+# awk will help us to print the 9th and 5th column of that output
+echo "Files and Directories in the Current Path:"
+ls -lh | awk '{print "-",$9,"(",$5,")"}'
 
-    # Part 2: Character Counting
-    read -p "Enter a line of text (Press Enter without text to exit): " input
+#checking if the length of msg variable is 0, it will break out of the loop
+while [ True ];
+do
+	read -p "Enter a line of text(Press enter without text to exit): " msg
+	if [ ${#msg} -eq 0 ]
+	then
+		break	
+	fi	
+	echo "Character Count: ${#msg} \n"
+done
 
-    # Exit if the user enters an empty string
-    if [ -z "$input" ]; then
-        echo "Exiting the Interactive Explorer. Goodbye!"
-        break
-    fi
+echo "Exiting the Interactive Explorer. Goodbye!"
 
-    # Calculate and print the character count for the input line
-    char_count=$(echo -n "$input" | wc -m)
-    echo "Character Count: $char_count"
-done

Challenges/Day_3/user_management.sh

@@ -1,94 +1,121 @@
 #!/bin/bash
 
-# Function to display usage information and available options
-function display_usage {
-    echo "Usage: $0 [OPTIONS]"
-    echo "Options:"
-    echo "  -c, --create     Create a new user account."
-    echo "  -d, --delete     Delete an existing user account."
-    echo "  -r, --reset      Reset password for an existing user account."
-    echo "  -l, --list       List all user accounts on the system."
-    echo "  -h, --help       Display this help and exit."
+#this will be called when the user inputs nothing, -h or --help
+help(){
+	echo "Usage: ./user_management.sh [OPTIONS]"
+	echo "Options:"
+	echo " -c, --create     Create a new user account."
+	echo "-d, --delete      Delete and existing user account."
+	echo "-r, --reset       Reset password for an existing user account."
+	echo "-l, --list        List all user accounts on the system."
+	echo "-h, --help        Display this help and exit."
 }
 
-# Function to create a new user account
-function create_user {
-    read -p "Enter the new username: " username
+#this will be called when the user inputs -c or --create
+create(){
+	read -p "Enter the new username: " username
 
-    # Check if the username already exists
-    if id "$username" &>/dev/null; then
-        echo "Error: The username '$username' already exists. Please choose a different username."
-    else
-        # Prompt for password (Note: You might want to use 'read -s' to hide the password input)
-        read -p "Enter the password for $username: " password
+	#this line will check if the user exists or not
+	a=`grep -w $username /etc/passwd`
 
-        # Create the user account
-        useradd -m -p "$password" "$username"
-        echo "User account '$username' created successfully."
-    fi
-}
-
-# Function to delete an existing user account
-function delete_user {
-    read -p "Enter the username to delete: " username
+	#the length of "a" will not be zero if the user already exists
+	if [ ${#a} -ne 0 ]
+	then echo "Error: The username $username already exists. Please choose a different username."
+	else
+		#this will create the user as the user doesnt exist
+		read -p "Enter the password for $username: " password
+		sudo useradd $username
 
-    # Check if the username exists
-    if id "$username" &>/dev/null; then
-        userdel -r "$username"  # -r flag removes the user's home directory
-        echo "User account '$username' deleted successfully."
-    else
-        echo "Error: The username '$username' does not exist. Please enter a valid username."
-    fi
+		#this will give password to the command and any output will be not displayed on terminal
+		echo -e "$password\n$password" | sudo passwd $username 2>>/dev/null
+		echo "User account '$username' created successfully."
+	fi
 }
 
-# Function to reset the password for an existing user account
-function reset_password {
-    read -p "Enter the username to reset password: " username
+#this will be called when the user inputs -d or --delete
+delete(){
+	read -p "Enter the username to delete: " uname_del
 
-    # Check if the username exists
-    if id "$username" &>/dev/null; then
-        # Prompt for password (Note: You might want to use 'read -s' to hide the password input)
-        read -p "Enter the new password for $username: " password
+	#this line will check if the user exists or not
+	a=`grep -w $uname_del /etc/passwd`
+
+	#the length of "a" will not be zero if the user already exists
+	if [ ${#a} -eq 0 ]
+	then echo "Error: The username $uname_del doesn't exist. Please enter a valid username."
+	else
+		#this will delete the user as the user exists
+		sudo userdel $uname_del
+		echo "User account $uname_del deleted successfully"
+	fi
+}
 
-        # Set the new password
-        echo "$username:$password" | chpasswd
-        echo "Password for user '$username' reset successfully."
-    else
-        echo "Error: The username '$username' does not exist. Please enter a valid username."
-    fi
+#this will be called when the user inputs -r or --reset
+reset(){
+	read -p "Enter the username to reset password: " uname_res
+
+	#this line will check if the user exists or not
+	a=`grep -w $uname_res /etc/passwd`
+
+	#the length of "a" will not be zero if the user already exists
+	if [ ${#a} -eq 0 ]
+	then echo "Error: The username $uname_res doesn't exist. Please enter a valid username."
+	else
+		#this will reset the password of the user as the user exists
+		read -p "Enter the new password for $uname_res: " newp
+		echo -e "$newp\n$newp" | sudo passwd $uname_res 2>>/dev/null
+		echo "Password for user '$uname_res' reset successfully." 
+	fi
 }
 
-# Function to list all user accounts on the system
-function list_users {
-    echo "User accounts on the system:"
-    cat /etc/passwd | awk -F: '{ print "- " $1 " (UID: " $3 ")" }'
+#this will be called when the user inputs -l or --list
+list(){
+	#this will print the 1st and 3rd column from the /etc/passwd file with required formatting.
+	awk -F: '{print "- "$1,"(UID: "$3")"}' /etc/passwd
 }
 
-# Check if no arguments are provided or if the -h or --help option is given
-if [ $# -eq 0 ] || [ "$1" = "-h" ] || [ "$1" = "--help" ]; then
-    display_usage
-    exit 0
-fi
+#we will use better than if-elif to call the functions based on the arguemnt passed
+#in case, we can use "and" to combine conditions, i have written multiple times.
+case "$1" in 
+	"")
+		help
+                ;;	
+	"-h")
+                help
+                ;;
+	"--help")
+                help
+                ;;
+	"--create")
+		create
+		;;
+	"-c")
+                create
+                ;;
+	"--delete")
+		delete
+
+		;;
+	"-d")
+                delete
+                ;;
+	"--reset")
+		reset
+		;;
+	"-r")
+                reset
+                ;;
+	"--list")
+                list
+                ;;
+	"-l")
+                list
+                ;;
+	*)
+ 	echo "This is not a valid option. Please check usage of this script below -" 
+  	help
+		;;
+esac
+
+
 
-# Command-line argument parsing
-while [ $# -gt 0 ]; do
-    case "$1" in
-        -c|--create)
-            create_user
-            ;;
-        -d|--delete)
-            delete_user
-            ;;
-        -r|--reset)
-            reset_password
-            ;;
-        -l|--list)
-            list_users
-            ;;
-        *)
-            echo "Error: Invalid option '$1'. Use '--help' to see available options."
-            exit 1
-            ;;
-    esac
-    shift
-done
+