Remove all objects in repo but specified object

Question

I'm trying to write a program that will get an object from github, without cloning the entire repo. The last line does not work, giving me a Syntax error: "(" unexpected. It is supposed to remove all files / directories except for that.

#!/bin/sh
object=$2 #sets item not to remove as second argument
address=$1 #sets github address (github.com/user/repo)
git clone $1 #clones it
location="${address##*/}" #gets part after last backslash
cd $location #cd's into it

#Syntax error: "(" unexpected
rm -rf !("$object") 

Answer 1

The extglob syntax for bash is not enabled by default, and that's what will give you the !(...) syntax. You'll have to turn it on if you want, by first changing your shebang to use bash

#! /bin/bash

then by turning on extglob by adding

shopt -s extglob

somewhere before that line