Merge pull request #1077 from nested-universe/patch-5

Fix installation alias selection

install.sh

@@ -1,4 +1,4 @@
-#! /bin/bash
+#!/usr/bin/env bash
 # Copyright (C) Juewuy
 
 [ -z "$url" ] && url="https://testingcf.jsdelivr.net/gh/juewuy/ShellCrash@dev"
@@ -45,6 +45,7 @@ error_down() {
     $echo "请参考 \033[32mhttps://github.com/juewuy/ShellCrash/blob/master/README_CN.md"
     $echo "\033[33m使用其他安装源重新安装！\033[0m"
 }
+
 #安装及初始化
 set_alias() {
     echo "-----------------------------------------------"
@@ -60,6 +61,7 @@ set_alias() {
     1) my_alias=crash ;;
     2) my_alias=sc ;;
     3) my_alias=mm ;;
+    0) echo "安装已取消"; exit 1 ;;
     *) my_alias=$res ;;
     esac
     cmd=$(ckcmd "$my_alias" | grep 'menu.sh')
@@ -69,6 +71,7 @@ set_alias() {
         set_alias
     }
 }
+
 gettar() {
     webget /tmp/ShellCrash.tar.gz "$url/ShellCrash.tar.gz"
     if [ "$result" != "200" ]; then