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ifconfig返回的信息中包括IP地址，但要在Shell中获取当前IP地址，则要麻烦一些

==获取方法==
由于不同系统中ifconfig返回信息的格式有一定差别，故分开讨论：<ref>http://www.cyberciti.biz/tips/read-unixlinux-system-ip-address-in-a-shell-script.html</ref>

'''Linux:'''
<source lang=bash>
LC_ALL=C ifconfig  | grep 'inet addr:'| grep -v '127.0.0.1' |
cut -d: -f2 | awk '{ print $1}'
</source>

'''FreeBSD/OpenBSD:'''
<source lang=bash>
LC_ALL=C ifconfig  | grep -E 'inet.[0-9]' | grep -v '127.0.0.1' |
awk '{ print $2}'
</source>

'''Solaris:'''
<source lang=bash>
LC_ALL=C ifconfig -a | grep inet | grep -v '127.0.0.1' |
awk '{ print $2}'
</source>

三段代码的原理类似，都是先获取含有IP的行，再去掉含有127.0.0.1的行。最后获取IP所在的列

==样例代码==
下面是一则示例的代码<ref>http://bash.cyberciti.biz/misc-shell/read-local-ip-address/</ref>：
<source lang=bash>
#!/bin/sh
# Shell script scripts to read ip address
# -------------------------------------------------------------------------
# Copyright (c) 2005 nixCraft project <http://cyberciti.biz/fb/>
# This script is licensed under GNU GPL version 2.0 or above
# -------------------------------------------------------------------------
# This script is part of nixCraft shell script collection (NSSC)
# Visit http://bash.cyberciti.biz/ for more information.
# -------------------------------------------------------------------------
# Get OS name
OS=`uname`
IO="" # store IP
case $OS in
   Linux) IP=`ifconfig  | grep 'inet addr:'| grep -v '127.0.0.1' | cut -d: -f2 | awk '{ print $1}'`;;
   FreeBSD|OpenBSD) IP=`ifconfig  | grep -E 'inet.[0-9]' | grep -v '127.0.0.1' | awk '{ print $2}'` ;;
   SunOS) IP=`ifconfig -a | grep inet | grep -v '127.0.0.1' | awk '{ print $2} '` ;;
   *) IP="Unknown";;
esac
echo "$IP"
</source>

==代码出处==
<references />

[[Category: Shell技巧]]