mac 指令

bash

echo $SHELL # 查看系统默认命令行工具
cat /etc/shells # 查看系统安装了哪些命令行工具
chsh -s /bin/bash # 切换命令行工具到bash
chsh -s /bin/zsh # 切换命令行工具到zsh

traceroute command

print the route packets take to network host

ping command

send ICMP ECHO_REQUEST packets to network hosts