升级mac os 10.13后，运行cocospods命令会报错：bad interpreter: No such file or directory，
bogon:location_workspace ss$ pod
-bash: /usr/local/bin/pod: /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/bin/ruby: bad interpreter: No such file or directory
解决办法：
升级ruby和cocospods
1.sudo gem update --system
2.sudo gem install cocoapods
但是很坑，第一个命令也可能报错
ERROR: While executing gem ... (Gem::RemoteFetcher::FetchError)
SSL_connect returned=1 errno=0 state=SSLv3 read server certificate B: certificate verify failed (https://ruby.taobao.org/specs.4.8.gz)
接着输入上述命令，就可以正常安装完成