Apurv day4

Challenges/Day_3/user_mamagement.sh

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+#Author : Apurv Samadder
+#Date : Aug 2 2023
+#Version: v1
+#Day 3  Bash Scripting Challenge - User Account Management.
+
+
+
+#!/bin/bash
+
+#Create a user 
+add_user()
+{
+echo "enter username "
+read username
+
+#echo "Enter password"
+#read pass
+
+if grep "${username}" /etc/passwd >/dev/null 2>&1; then
+
+  echo "User alread present"
+
+else
+	echo "enter password"
+	read pass
+	useradd  -m -p $pass $username && echo "Successfully added user"
+
+fi 
+}
+
+#delete user
+
+delete_user()
+{
+
+if [[ $(id -u) -ne 0 ]]; then
+    echo "This script must be run as root or with sudo privileges."
+    exit 1
+fi
+
+# Prompt the user for the username to delete
+read -p "Enter the username you want to delete: " username
+
+# Check if the username exists
+if id "$username" &>/dev/null; then
+    # Delete the user and their home directory
+    userdel -r "$username"
+    echo "User '$username' and home directory deleted."
+else
+    echo "User '$username' does not exist."
+fi
+}
+
+
+reset_passwd()
+{
+
+if [[ $(id -u) -ne 0 ]]; then
+    echo "This script must be run as root or with sudo privileges."
+    exit 1
+fi
+
+# Prompt the user for the username to changes password
+read -p "Enter the username you want to delete: " username
+
+# Check if the username exists
+if id "$username" &>/dev/null; then
+    # Changes the password if user exist
+    passwd "$username"
+    echo "User '$username' Password changed."
+else
+    echo "User '$username' does not exist."
+fi
+}
+
+list_user()
+{
+	# Read uid column  /etc/passwd
+	for userid in `awk -F: '{print $3}' /etc/passwd`
+        do
+                if ("$userid" >= 1000); then
+                        echo "Valid User" :`cat /etc/passwd | grep $userid | awk -F: '{print $1,$3}'`
+                fi
+        done
+}
+
+
+user_mgmt()
+{
+echo "options"
+echo "-c,--create  create a new user accoutn"
+echo "-d, --delete Delete and existing user account"
+echo "-r, --reset  Reset a password for existing user"
+echo "-l, --list  List all the user in system"
+echo "-h, --help Display this help and exit"
+
+read option
+
+case $option  in
+    -c|--create)
+      add_user
+      ;;
+    -d|--delete)
+      echo "inside delete" 
+      delete_user
+      ;;
+    -r|--reset)
+      echo "inside reset"
+      reset_passwd  
+      ;;
+    -l|--list)
+      list_user
+      echo "inside list" 
+      ;;
+    -h|--help)
+      echo "inside help" 
+      ;;  
+      *)
+      echo "please enter valid option"
+      user_mgmt
+      ;;
+esac
+}
+
+user_mgmt
+
+

Challenges/Day_4/monitoring_metric.sh

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+####################################
+#Author : Apurv Samadder
+#Date : Aug 3 2023
+#Version: v1
+#Day 4  Bash Scripting Challenge - Part_2_Monitoring_Metrics.md
+####################################
+
+
+#!/bin/bash
+
+#Function to check get metrices
+
+display_metric()
+{
+
+    # Get CPU usage percentage
+    cpu_usage=$(top -bn 1 | awk '/%Cpu/{print $2}' | cut -d. -f1)
+
+    # Get memory usage percentage
+    mem_usage=$(free | awk '/Mem/{printf("%.2f", $3/$2 * 100)}')
+
+    # Get disk usage percentage of root partition
+    disk_usage=$(df -h / | awk '/\//{print $5}' | cut -d'%' -f1)
+
+    # Display metrics
+    echo "CPU Usage:  $cpu_usage%   Mem Usage:  $mem_usage%   Disk Space:  $disk_usage%"
+
+    # Sleep for the specified interval (in seconds) before displaying metrics again
+    sleep_interval=2
+   sleep "$sleep_interval"
+}
+
+
+
+# Function to check and manage service
+check_service() {
+    service_name="$1"
+
+    # Check if the service is running
+    if systemctl is-active --quiet "$service_name"; then
+	echo "**********************************"
+        echo "$service_name is running."
+    else
+	echo "**********************************"    
+        echo "$service_name is not running."
+        read -p "Do you want to start $service_name? (y/n): " choice
+        if [[ "$choice" =~ ^[Yy]$ ]]; then
+            sudo systemctl start "$service_name"
+	 echo "*********************************"   
+            echo "Starting $service_name..."
+        else
+	  echo "********************************"	
+            echo "Service not started."
+        fi
+    fi
+}
+
+
+#User management function to get Input and work accordingly
+
+user_mgmt()
+{
+echo "-------------------------------"	
+echo "**MAIN MENU**"
+echo " 1. View System Metrics"
+echo " 2. Monitor a specific service"
+echo " 3. Exit"
+echo " Please enter a valid option:"
+echo "-------------------------------"
+read option
+
+case $option  in
+     1)
+# here we firstly display the metrics and wait for user input and again display metrics or menu	     
+	display_metric     
+	while true; do
+       	echo "Press Enter to continue & press 1  to for main menu"
+	read temp
+	if [ "$temp" == "1" ];
+	then 
+		user_mgmt
+
+        else
+	       display_metric	
+        fi	
+    	done
+      ;;
+      2)
+      read -p "Enter the name of the service: " service_name
+      check_service "$service_name"
+      user_mgmt
+      ;;
+      3)
+      echo "Thanks for Visiting...."
+      sleep 5 
+      exit
+      ;;
+      *)
+      echo "please enter valid option"
+      user_mgmt
+      ;;
+esac
+}
+
+user_mgmt

Challenges/Day_4/monitoring_pro.sh

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+#Author : Apurv Samadder
+#Date : Aug 3 2023
+#Version: v1
+#Day 4  Bash Scripting Challenge - he script will check if the Nginx process is running and restart it if it's not.
+
+
+#!/bin/bash
+
+restart_serv(){
+serv_active_restart=`sudo systemctl is-active $1`
+        case "$serv_active_restart" in
+                active)
+                        #this will get printed in the 2nd or 3rd try if it wasn't running in the 1st or 2nd try
+                        echo "Process $1 is running."
+                        ;;
+       		 failed|inactive)
+        	echo "Process $1 is not running. Attempting to restart..."
+		  #this will restart the process.
+            	sudo systemctl restart $1
+        	if [ systemctl is-active "$1" == true ] ;
+        	then
+            		echo "Service is started"
+        	fi
+        	;;
+        	*)
+       		 esac
+}
+
+# Function to check and manage service
+check_service() {
+    service_name="$1"
+
+    # Check if the service is running
+    if systemctl is-active --quiet "$service_name"; then
+        echo "**********************************"
+        echo "$service_name is running."
+    else
+        echo "**********************************"    
+        echo "$service_name is not running."
+        read -p "Do you want to start $service_name? (y/n): " choice
+        if [[ "$choice" =~ ^[Yy]$ ]]; then
+            for i in {1..3}
+             do
+              restart_serv $service_name
+              sleep 2
+             done
+        else
+          echo "********************************"       
+            echo "Service not started."
+        fi
+    fi
+}
+read -p "Enter the name of the service: " service_name
+check_service "$service_name"