lucapericlp · July 27, 2025 17:57
diff --git a/quick_remove.sh b/quick_remove.sh
 #!/bin/bash

 # A script to terminate an EC2 instance and remove its local SSH config entry.

 # --- Configuration ---
 SSH_CONFIG_FILE="$HOME/.ssh/config"

 # Exit script if any command fails.
 set -e

 # --- 1. Get SSH Alias from Command Line ---
 if [ -z "$1" ]; then
    echo "❌ Error: No SSH alias provided."
    echo "Usage: $0 <ssh-alias>"
    exit 1
 fi

 SSH_ALIAS="$1"

 # --- 2. Find Instance ID from SSH Config ---
 echo "🔎 Searching for '$SSH_ALIAS' in $SSH_CONFIG_FILE..."

 # Find the line number of the "Host" directive for the given alias.
 # We use `head -n 1` to ensure we only act on the first match if there are duplicates.
 HOST_LINE_NUM=$(grep -n "Host $SSH_ALIAS" "$SSH_CONFIG_FILE" | head -n 1 | cut -d: -f1)

 if [ -z "$HOST_LINE_NUM" ]; then
    echo "❌ Error: Could not find an SSH entry for alias '$SSH_ALIAS' in $SSH_CONFIG_FILE."
    exit 1
 fi

 # The launch script places a comment with the Instance ID on the line directly above the "Host" line.
 COMMENT_LINE_NUM=$((HOST_LINE_NUM - 1))

 # Extract the Instance ID from that comment line using sed and awk.
 INSTANCE_ID=$(sed -n "${COMMENT_LINE_NUM}p" "$SSH_CONFIG_FILE" | awk '{print $6}')

 # Validate that we found a plausible instance ID.
 if [[ -z "$INSTANCE_ID" || ! "$INSTANCE_ID" =~ ^i- ]]; then
    echo "❌ Error: Could not parse a valid Instance ID for alias '$SSH_ALIAS'."
    echo "Please check the formatting in $SSH_CONFIG_FILE around line $HOST_LINE_NUM."
    exit 1
 fi

 echo "✅ Found Instance ID: $INSTANCE_ID"

 # --- 3. Confirm and Terminate Instance ---
 read -p "Are you sure you want to terminate instance $INSTANCE_ID? [y/N] " confirm
 # This regex checks for 'y' or 'Y'.
 if [[ ! "$confirm" =~ ^[yY] ]]; then
    echo "Termination cancelled."
    exit 0
 fi

 echo "🗑️  Terminating instance $INSTANCE_ID..."
 # Redirect stdout to /dev/null to keep the output clean.
 aws ec2 terminate-instances --instance-ids "$INSTANCE_ID" --output text > /dev/null

 echo "⏳ Waiting for instance to fully terminate..."
 aws ec2 wait instance-terminated --instance-ids "$INSTANCE_ID"
 echo "✅ Instance terminated."

 # --- 4. Clean up SSH Config ---
 echo "🧹 Cleaning up SSH config entry..."

 # The block created by the launch script is 10 lines total, plus a preceding blank line.
 # This makes it hard to remove robustly without line numbers.
 # The block starts with a blank line, then a comment, then the "Host" line.
 # So, the block to delete starts 2 lines *before* our HOST_LINE_NUM.
 START_DELETE=$((HOST_LINE_NUM - 2))
 # The block ends 7 lines *after* our HOST_LINE_NUM.
 END_DELETE=$((HOST_LINE_NUM + 7))

 # Use sed to delete the line range. The `-i.bak` option creates a backup and
 # is compatible with both Linux (GNU) and macOS (BSD) versions of sed.
 sed -i.bak "${START_DELETE},${END_DELETE}d" "$SSH_CONFIG_FILE"

 echo "✅ SSH config entry removed. Original config saved to ${SSH_CONFIG_FILE}.bak"

 # --- 5. Final Output ---
 echo "--------------------------------------------------"
 echo "✅ Success! Instance '$INSTANCE_ID' has been terminated and config cleaned up."
 echo "--------------------------------------------------"
	#!/bin/bash

	# A script to terminate an EC2 instance and remove its local SSH config entry.

	# --- Configuration ---
	SSH_CONFIG_FILE="$HOME/.ssh/config"

	# Exit script if any command fails.
	set -e

	# --- 1. Get SSH Alias from Command Line ---
	if [ -z "$1" ]; then
	echo "❌ Error: No SSH alias provided."
	echo "Usage: $0 <ssh-alias>"
	exit 1
	fi

	SSH_ALIAS="$1"

	# --- 2. Find Instance ID from SSH Config ---
	echo "🔎 Searching for '$SSH_ALIAS' in $SSH_CONFIG_FILE..."

	# Find the line number of the "Host" directive for the given alias.
	# We use `head -n 1` to ensure we only act on the first match if there are duplicates.
	HOST_LINE_NUM=$(grep -n "Host $SSH_ALIAS" "$SSH_CONFIG_FILE" \| head -n 1 \| cut -d: -f1)

	if [ -z "$HOST_LINE_NUM" ]; then
	echo "❌ Error: Could not find an SSH entry for alias '$SSH_ALIAS' in $SSH_CONFIG_FILE."
	exit 1
	fi

	# The launch script places a comment with the Instance ID on the line directly above the "Host" line.
	COMMENT_LINE_NUM=$((HOST_LINE_NUM - 1))

	# Extract the Instance ID from that comment line using sed and awk.
	INSTANCE_ID=$(sed -n "${COMMENT_LINE_NUM}p" "$SSH_CONFIG_FILE" \| awk '{print $6}')

	# Validate that we found a plausible instance ID.
	if [[ -z "$INSTANCE_ID" \|\| ! "$INSTANCE_ID" =~ ^i- ]]; then
	echo "❌ Error: Could not parse a valid Instance ID for alias '$SSH_ALIAS'."
	echo "Please check the formatting in $SSH_CONFIG_FILE around line $HOST_LINE_NUM."
	exit 1
	fi

	echo "✅ Found Instance ID: $INSTANCE_ID"

	# --- 3. Confirm and Terminate Instance ---
	read -p "Are you sure you want to terminate instance $INSTANCE_ID? [y/N] " confirm
	# This regex checks for 'y' or 'Y'.
	if [[ ! "$confirm" =~ ^[yY] ]]; then
	echo "Termination cancelled."
	exit 0
	fi

	echo "🗑️ Terminating instance $INSTANCE_ID..."
	# Redirect stdout to /dev/null to keep the output clean.
	aws ec2 terminate-instances --instance-ids "$INSTANCE_ID" --output text > /dev/null

	echo "⏳ Waiting for instance to fully terminate..."
	aws ec2 wait instance-terminated --instance-ids "$INSTANCE_ID"
	echo "✅ Instance terminated."

	# --- 4. Clean up SSH Config ---
	echo "🧹 Cleaning up SSH config entry..."

	# The block created by the launch script is 10 lines total, plus a preceding blank line.
	# This makes it hard to remove robustly without line numbers.
	# The block starts with a blank line, then a comment, then the "Host" line.
	# So, the block to delete starts 2 lines before our HOST_LINE_NUM.
	START_DELETE=$((HOST_LINE_NUM - 2))
	# The block ends 7 lines after our HOST_LINE_NUM.
	END_DELETE=$((HOST_LINE_NUM + 7))

	# Use sed to delete the line range. The `-i.bak` option creates a backup and
	# is compatible with both Linux (GNU) and macOS (BSD) versions of sed.
	sed -i.bak "${START_DELETE},${END_DELETE}d" "$SSH_CONFIG_FILE"

	echo "✅ SSH config entry removed. Original config saved to ${SSH_CONFIG_FILE}.bak"

	# --- 5. Final Output ---
	echo "--------------------------------------------------"
	echo "✅ Success! Instance '$INSTANCE_ID' has been terminated and config cleaned up."
	echo "--------------------------------------------------"