一个简单的判断IP地址是否合法的shell/ target=_blank class=infotextkey>shell脚本程序
IP地址是32位的,可以由4个十进制数值表示,每个数值的范围都是0~255.
例子:
复制代码 代码示例:
#!/bin/bash
# Test an IP address for validity:
# Usage:
# valid_ip IP_ADDRESS
# if [[ $? -eq 0 ]]; then echo good; else echo bad; fi
# OR
# if valid_ip IP_ADDRESS; then echo good; else echo bad; fi
#
function valid_ip()
{
local ip=$1
local stat=1
if [[ $ip =~ ^[0-9]{1,3}/.[0-9]{1,3}/.[0-9]{1,3}/.[0-9]{1,3}$ ]]; then
OIFS=$IFS
IFS='.'
ip=($ip)
IFS=$OIFS
[[ ${ip[0]} -le 255 && ${ip[1]} -le 255 /
&& ${ip[2]} -le 255 && ${ip[3]} -le 255 ]]
stat=$?
fi
return $stat
}
# If run directly, execute some tests.
if [[ "$(basename $0 .sh)" == 'valid_ip' ]]; then
ips='
4.2.2.2
a.b.c.d
192.168.1.1
0.0.0.0
255.255.255.255
255.255.255.256
192.168.0.1
192.168.0
1234.123.123.123
'
for ip in $ips
do
if valid_ip $ip; then stat='good'; else stat='bad'; fi
printf "%-20s: %s/n" "$ip" "$stat"
done
fi
将代码保存为valid_ip.sh,加上执行权限后,直接运行:
复制代码 代码示例:
# sh valid_ip.sh
4.2.2.2 : good
a.b.c.d : bad
192.168.1.1 : good
0.0.0.0 : good
255.255.255.255 : good
255.255.255.256 : bad
192.168.0.1 : good
192.168.0 : bad
1234.123.123.123 : bad