fix get_ssh_key script

bin/get_ssh_key

@@ -6,17 +6,18 @@ set -euo pipefail
 # Example usage:
 # $ get_ssh_key "id_rsa_raspi"
 
-key_name="{$1:-}"
+key_name="${1:-}"
 
 if [ -z "$key_name" ]; then
-	echo "key_name not passed. Nothing was done."
-	return 1
+	echo "key_name not passed as argument. Nothing was done."
+	exit 1
 fi
 
 key_path="$HOME/.ssh/$key_name"
 
 if [ -f "$key_path" ]; then
 	echo "$key_path already exists. Nothing was done to it."
-else
-	op get document "$key_name" >"$key_path" && chmod 400 "$key_path"
+	exit 2
 fi
+
+op document get "$key_name" >"$key_path" && chmod 400 "$key_path"