add-ssh-key

#!/bin/bash

# Description: This script add public SSH key to authorized_keys for SSH key-based authentication.

# Prints an error message to stderr
print_error() {
  echo "Error: $1" >&2
  exit 1
}

# Prints an help message 
print_help() {
	echo "add-ssh-key, adds an public SSH key to authorized_keys"
  echo "  Usage:"
  echo "      add-ssh-key"
}

case "${1:-}" in
  # Exit with code 0 only if help was explicitly requested
  -h|--help)
    print_help
    exit 0
    ;;
  '')
    print_help
    exit 1
    ;;
esac

# Gets SSH key from user
while [[ -z "$sshkey" ]]
do
    read -p "Enter Public SSH Key >> " sshkey
done

# Create ssh directory
mkdir -p ~/.ssh

# Add key to authorized_keys
echo $sshkey >> ~/.ssh/authorized_keys

# Fix permissions and ownership for ssh directory
chmod -R go= ~/.ssh
chown -R $USER:$USER ~/.ssh