1:
$ ping github.com
control + c 停止 ping
结果：
--- github.com ping statistics ---
495 packets transmitted, 375 packets received, 24.2% packet loss
round-trip min/avg/max/stddev = 280.755/339.404/450.118/37.344 ms
2:
cocoapods search "第三方框架"
搜索结束后，不会自动退出显示搜索结果的状态。显示 “End”
此时按“Q”,退出结果显示，回到命令输入状态！