Series 4: Ep 7: Debugging Your Code

Don't let errors stop you! This episode focuses on practical debugging techniques for both PowerShell and Bash scripts. We'll intentionally introduce common errors (like typos or wrong parameters) and walk through how to identify and fix them, building crucial troubleshooting skills.Powershell Script:#Script to log multiple event IDs$BeginTime = (Get-Date).AddMinutes(-20)Get-EventLog -LogName "Securityy" -After $BeginTime |Where-Object { $_.EventID -in '4624', '4625'} |Select-Object TimeGenerated, EventID, Message |Format-Table -AutoSize |Out-Files C:\EventLogs_MultipleEvents.txtBASH Script:#!/bin/bash#VariablesUSERNAME="testuser" # User accountnamePASSWORD="P@ssw0rd" # User passwordGROUP="testgroup" # Custom groupnameSSH_DIR="/home/$USERNAME/.ssh"PUB_KEY="ssh-rsa AAAAB3...your-public-key... user@kali"#Step 1: Check ifuser already existsif id "$USERNAME" &>/dev/null; then  echo "Error: User '$USERNAME'already exists!"  exit 1fi#Step 2: Create userand set passwordecho "Creating user '$USERNAME'..."useradd -m -n -s /bin/bash "$USERNAME" # Error 1: -n is an invalidoptionif [ $? -ne 0 ]; then  echo "Error: Failed to create user'$USERNAME'"  exit 1fiecho "$USERNAME:$PASSWORD" | chpasswdecho "Password set for user '$USERNAME'."#Step 3: Add user tosudoersecho "Granting sudo access to '$USERNAME'..."usermod -aG sudo "$USERNAME"if [ $? -ne 0 ]; then  echo "Error: Failed to add'$USERNAME' to sudoers"  exit 1fi#Step 4: Createcustom group and add userecho "Creating group '$GROUP' and adding user..."groupadd "$GROUP" 2>/dev/nullusermod -aG "wronggroup" "$USERNAME" # Error 2:"wronggroup" does not existif [ $? -ne 0 ]; then  echo "Error: Failed to add'$USERNAME' to group '$GROUP'"  exit 1fi#Step 5: Setup SSHkey-based authenticationecho "Setting up SSH key-based authentication..."mkdir -p "$SSH_DIR"echo "$PUB_KEY" > "$SSH_DIR/authorized_keys"chmod 600 "$SSH_DIR/authorized_keys"chmod 700 "$SSH_DIR"chown -R "$USERNAME:$USERNAME" "$SSH_DIR"if [ $? -ne 0 ]; then  echo "Error: Failed to set up SSHkeys"  exit 1fiecho "SSH keys configured for '$USERNAME'."#Step 6: Setpassword expiry to 30 daysecho "Setting password expiry policy for '$USERNAME'..."chage -M 30 "$USERNAME"if [ $? -ne 0 ]; then  echo "Error: Failed to setpassword expiry"  exit 1fi#Step 7: Logactivity to/var/log/user_setup.logLOG_FILE="/var/log/user_setup.log"echo "$(date) - User '$USERNAME' created and configured" >>"$LOG_FILE"if [ $? -ne 0 ]; then  echo "Error: Failed to write logto $LOG_FILE"  exit 1fi#Step 8:Confirmation Messageecho "Testing SSH connection to '$USERNAME'@localhosts..."ssh "$USERNAME@localhost"if [ $? -ne 0 ]; thenecho "Error: SSH connection failed."exit 1fiecho "User '$USERNAME' created and configured successfully!"