shell： ip合法性检查

ipcalc -cs x.x.x.x && echo 'IP Right' || echo 'IP Error'

ipcalc: ip address expected
Usage: ipcalc [OPTION...]
-c, --check         Validate IP address for specified address family
-4, --ipv4          IPv4 address family (default)
-6, --ipv6          IPv6 address family
-b, --broadcast     Display calculated broadcast address
-h, --hostname      Show hostname determined via DNS
-m, --netmask       Display default netmask for IP (class A, B, or C)
-n, --network       Display network address
-p, --prefix        Display network prefix
-s, --silent        Don't ever display error messages

Help options:
-?, --help          Show this help message
--usage             Display brief usage message