17、树莓派操作系统基础系统管理与systemd应用入门

树莓派操作系统基础系统管理与systemd应用入门

1. 基础系统管理

1.1 ping命令与权限控制

在系统管理中， ping 命令是常用的网络测试工具。以下是使用 ping 命令测试本地主机的示例：

$ .ping localhost
PING localhost(localhost (::1)) 56 data bytes
64 bytes from localhost (::1): icmp_seq=1 ttl=64 time=0.256 ms
64 bytes from localhost (::1): icmp_seq=2 ttl=64 time=0.226 ms
64 bytes from localhost (::1): icmp_seq=3 ttl=64 time=0.232 ms
64 bytes from localhost (::1): icmp_seq=4 ttl=64 time=0.257 ms
64 bytes from localhost (::1): icmp_seq=5 ttl=64 time=0.234 ms
64 bytes from localhost (::1): icmp_seq=6 ttl=64 time=0.233 ms
<Ctrl>+C
--- localhost ping statistics ---
6 packets transmitted, 6 received, 0% packet loss, time 5112ms
rtt min/avg/max/mdev = 0.226/0.239/