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.txt

BASH Script:

#!/bin/bash
#Variables
USERNAME="testuser" # User accountname
PASSWORD="P@ssw0rd" # User password
GROUP="testgroup" # Custom groupname
SSH_DIR="/home/$USERNAME/.ssh"
PUB_KEY="ssh-rsa AAAAB3...your-public-key... user@kali"

#Step 1: Check ifuser already exists
if id "$USERNAME" &>/dev/null; then
  echo "Error: User '$USERNAME'already exists!"
  exit 1
fi

#Step 2: Create userand set password
echo "Creating user '$USERNAME'..."
useradd -m -n -s /bin/bash "$USERNAME" # Error 1: -n is an invalidoption
if [ $? -ne 0 ]; then
  echo "Error: Failed to create user'$USERNAME'"
  exit 1
fi
echo "$USERNAME:$PASSWORD" | chpasswd
echo "Password set for user '$USERNAME'."

#Step 3: Add user tosudoers
echo "Granting sudo access to '$USERNAME'..."
usermod -aG sudo "$USERNAME"
if [ $? -ne 0 ]; then
  echo "Error: Failed to add'$USERNAME' to sudoers"
  exit 1
fi

#Step 4: Createcustom group and add user
echo "Creating group '$GROUP' and adding user..."
groupadd "$GROUP" 2>/dev/null
usermod -aG "wronggroup" "$USERNAME" # Error 2:"wronggroup" does not exist
if [ $? -ne 0 ]; then
  echo "Error: Failed to add'$USERNAME' to group '$GROUP'"
  exit 1
fi

#Step 5: Setup SSHkey-based authentication
echo "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 [ $? -ne 0 ]; then
  echo "Error: Failed to set up SSHkeys"
  exit 1
fi
echo "SSH keys configured for '$USERNAME'."

#Step 6: Setpassword expiry to 30 days
echo "Setting password expiry policy for '$USERNAME'..."
chage -M 30 "$USERNAME"
if [ $? -ne 0 ]; then
  echo "Error: Failed to setpassword expiry"
  exit 1
fi

#Step 7: Logactivity to/var/log/user_setup.log
LOG_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 1
fi

#Step 8:Confirmation Message
echo "Testing SSH connection to '$USERNAME'@localhosts..."
ssh "$USERNAME@localhost"
if [ $? -ne 0 ]; then
echo "Error: SSH connection failed."
exit 1
fi
echo "User '$USERNAME' created and configured successfully!"