Add SSH public key

add-ssh-key.sh

#!/bin/bash

# Get current user and home directory
USER=$(whoami)
HOME_DIR=$HOME
SSH_DIR="$HOME_DIR/.ssh"
AUTH_KEYS="$SSH_DIR/authorized_keys"

# Check if a key was provided
if [ -z "$1" ]; then
  echo "Usage: $0 \"public_key_string\""
  exit 1
fi

PUBKEY="$1"

# Create .ssh directory if it does not exist
if [ ! -d "$SSH_DIR" ]; then
  mkdir -p "$SSH_DIR"
  chmod 700 "$SSH_DIR"
fi

# Check if the key already exists
if grep -Fxq "$PUBKEY" "$AUTH_KEYS" 2>/dev/null; then
  echo "This public key already exists in $AUTH_KEYS"
else
  echo "$PUBKEY" >> "$AUTH_KEYS"
  chmod 600 "$AUTH_KEYS"
  echo "Public key has been added to $AUTH_KEYS"
fi