blocks|key|2875955|text|不需要在Bash中执行不可移植的ifconfig解析。在Python中，这是一个简单的一行：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2875956|python+-c+'import+socket;+print(socket.gethostbyname(socket.gethostname()))'|code-block|syntax|javascript|2875957|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

No need to do unportable ifconfig parsing in Bash. It's a trivial one-liner in Python:

<pre><code>python -c 'import socket; print(socket.gethostbyname(socket.gethostname()))'
</code></pre>

blocks|key|273434|text|下面这两项工作(CentOS+5)都在这里完成。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|273435|ip+addr+show+eth0+%7C+awk+'$1+==+"inet"+{gsub(/\/.*$/,+"",+$2);+print+$2}'

ifconfig+eth0+%7C+awk+'/inet+addr/+{gsub("addr:",+"",+$2);+print+$2}'|code-block|syntax|javascript|273436|对于OS+(至少v10.11+(El+Capitan)+)：|offset|length|273437|ifconfig+en0+%7C+awk+'$1+==+"inet"+{print+$2}'|273438|entityMap|0|LINK|mutability|MUTABLE|url|https://en.wikipedia.org/wiki/OS_X_El_Capitan^0|0|0|8|6|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|V|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|W|8|@]|9|@$I|X|J|Y|1|Z]]|A|$]]|$1|K|3|L|5|D|7|10|8|@]|9|@]|A|$E|F]]|$1|M|3|-4|5|6|7|11|8|@]|9|@]|A|$]]]|N|$O|$5|P|Q|R|A|$S|T]]]]

Both the following work here (CentOS 5).

<pre><code>ip addr show eth0 | awk '$1 == "inet" {gsub(/\/.*$/, "", $2); print $2}'

ifconfig eth0 | awk '/inet addr/ {gsub("addr:", "", $2); print $2}'
</code></pre>

For OS X (<a href="https://en.wikipedia.org/wiki/OS_X_El_Capitan">v10.11</a> (El Capitan) at least):

<pre><code>ifconfig en0 | awk '$1 == "inet" {print $2}'
</code></pre>

blocks|key|2876000|text|在eth0的情况下，下面的工作对我来说是可行的。试着用同样的逻辑来调整它。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2876001|ifconfig+eth0+%7C+grep+'inet+addr:'+%7C+cut+-d:+-f2+%7C+awk+'{+print+$1}'++|code-block|syntax|javascript|2876002|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

In case of eth0, the following works for me. Try to tweak it with the same logic.

<pre><code>ifconfig eth0 | grep 'inet addr:' | cut -d: -f2 | awk '{ print $1}' 
</code></pre>

blocks|key|1879023|text|嗯，经过几个小时的挣扎，我终于把它做对了：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1879024|ifconfig+en1+%7C+awk+'{+print+$2}'+%7C+grep+-E+-o+"([0-9]{1,3}[\.]){3}[0-9]{1,3}"|code-block|syntax|javascript|1879025|我所缺少的最后一部分就是grep，这是我列表中IP地址的模式。|1879026|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

Well, after hours of struggling I finally got it right:

<pre><code>ifconfig en1 | awk '{ print $2}' | grep -E -o "([0-9]{1,3}[\.]){3}[0-9]{1,3}"
</code></pre>

That last part I had missing is just grep a pattern of IP addresses from my list.

blocks|key|1879053|text|您可以使用awk来选择inet行和解析IP地址，如下所示：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1879054|$+ip+addr+ls+docker0+%7C+awk+'/inet+/+{print+$2}'+%7C+cut+-d"/"+-f1
172.17.42.1|code-block|syntax|javascript|1879055|在上面的示例中，将设备句柄eth0替换为docker0。此外，如果您想要一个纯AWK实现，您可以这样做“切割”：|1879056|$+ip+addr+ls+docker0+%7C+awk+'/inet+/+{split($2,+ary,+/\//);+print+ary[1]}'
172.17.42.1|1879057|entityMap|0|LINK|mutability|MUTABLE|url|http://en.wikipedia.org/wiki/AWK^0|5|3|B|4|0|0|D|4|K|7|13|3|0|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@$9|X|A|Y|B|C]|$9|Z|A|10|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|11|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|12|8|@$9|13|A|14|B|C]|$9|15|A|16|B|C]]|D|@$9|17|A|18|1|19]]|E|$]]|$1|M|3|N|5|H|7|1A|8|@]|D|@]|E|$I|J]]|$1|O|3|-4|5|6|7|1B|8|@]|D|@]|E|$]]]|P|$Q|$5|R|S|T|E|$U|V]]]]

You can use <code>awk</code> to do both the selecting of the <code>inet</code> line and the parsing of the IP address like so:

<pre><code>$ ip addr ls docker0 | awk '/inet / {print $2}' | cut -d"/" -f1
172.17.42.1
</code></pre>

In the example above, substitute the device handle <code>eth0</code> in for <code>docker0</code>. Also, if you want a pure <a href="http://en.wikipedia.org/wiki/AWK" rel="nofollow">AWK</a> implementation, you can do the "cutting" within like so:

<pre><code>$ ip addr ls docker0 | awk '/inet / {split($2, ary, /\//); print ary[1]}'
172.17.42.1
</code></pre>

blocks|key|2876110|text|如果您只是在寻找"inet“而不是"inet6"，这对我来说是可行的：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2876111|/usr/bin/ifconfig+eth0+%7C+grep+--word-regexp+inet+%7C+awk+'{print+$2}'|code-block|syntax|javascript|2876112|“--词-regexp”将使grep查找整个单词"inet“，而不匹配单词的部分，即"inet”与"inet6“不匹配|2876113|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

If you're looking for just "inet" and not "inet6", this works for me:

<pre><code>/usr/bin/ifconfig eth0 | grep --word-regexp inet | awk '{print $2}'
</code></pre>

"--word-regexp" will make grep look for the whole word "inet" and not match partials of words, i.e. "inet" won't match "inet6" - "inet" will only match lines with "inet" in them.

blocks|key|1879117|text|类似于JSR，但与awk和cut的顺序相反：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1879118|my_ip=$(ifconfig+en1+%7C+grep+'inet+addr'+%7C+awk+'{print+$2}'+%7C+cut+-d:+-f+2)
echo+${my_ip}|code-block|syntax|javascript|1879119|entityMap^0|9|3|D|3|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]|$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|R|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|S|8|@]|D|@]|E|$]]]|L|$]]

Similar to JSR, but with <code>awk</code> and <code>cut</code> in reverse order:

<pre><code>my_ip=$(ifconfig en1 | grep 'inet addr' | awk '{print $2}' | cut -d: -f 2)
echo ${my_ip}
</code></pre>

blocks|key|1879131|text|这对我来说很管用：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1879132|ifconfig+eth0+%7C+awk+'/inet+addr/{print+substr($2,6)}'|offset|length|style|CODE|1879133|entityMap^0|0|0|1H|0^^$0|@$1|2|3|4|5|6|7|J|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|K|8|@$D|L|E|M|F|G]]|9|@]|A|$]]|$1|H|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|I|$]]

This works for me: 
<code>ifconfig eth0 | awk '/inet addr/{print substr($2,6)}'</code>

blocks|key|273693|text|在VDS/VPS上工作的代码：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|273694|ifconfig+%7C+grep+-A2+"venet0:0\%7Ceth0"+%7C+grep+'inet+addr:'+%7C+sed+-r+'s/.*inet+addr:([%5E+]%2B).*/\1/'+%7C+head+-1|code-block|syntax|javascript|273695|或|273696|ifconfig+%7C+grep+'inet+addr:'+%7C+grep+-v+127.0.0.1+%7C+head+-n1+%7C+cut+-f2+-d:+%7C+cut+-f1+-d+'+'|273697|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

blocks|key|1879158|text|ifconfig+eth0+%7C+awk+'/inet+addr/{sub("addr:","");+print+$2}'|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|1879159|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>ifconfig eth0 | awk '/inet addr/{sub("addr:",""); print $2}'
</code></pre>

blocks|key|1879193|text|用patch的回答，让它更笼统一些，|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|1879194|即:跳过一切直到第一个数字。|1879195|ifconfig+eth0+%7C+awk+'/inet+addr/{sub(/[%5E0-9]*/,"");+print+$1}'|CODE|1879196|甚至更好：|1879197|ifconfig+eth0+%7C+awk+'/inet+/{sub(/[%5E0-9]*/,"");+print+$1}'|1879198|请注意结尾的打印部分-从$2更改为$1。|unordered-list-item|1879199|使用Perl+Regex：|1879200|ifconfig+eth0+%7C+grep+-oP+'(?<=+inet+addr:)[%5E+]%2B'|1879201|说明:+grep+-oP使用Perl搜索精确匹配。|1879202|“棘手”的部分是正则表达式本身；|1879203|(?<=+inet+addr:)的意思是-字符串inet+addr:就在我们要找的东西的左边。|ordered-list-item|1879204|[%5E+]%2B+(请注意%5E后面的空格)--它意味着查找所有东西，直到第一个空白--在我们的例子中，是IP地址。|1879205|entityMap^0|1|6|0|0|0|1Q|0|0|0|1M|0|C|2|H|2|0|0|0|1C|0|0|0|0|G|O|A|0|0|5|0^^$0|@$1|2|3|4|5|6|7|16|8|@$9|17|A|18|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|19|8|@]|D|@]|E|$]]|$1|H|3|I|5|6|7|1A|8|@$9|1B|A|1C|B|J]]|D|@]|E|$]]|$1|K|3|L|5|6|7|1D|8|@]|D|@]|E|$]]|$1|M|3|N|5|6|7|1E|8|@$9|1F|A|1G|B|J]]|D|@]|E|$]]|$1|O|3|P|5|Q|7|1H|8|@$9|1I|A|1J|B|C]|$9|1K|A|1L|B|C]]|D|@]|E|$]]|$1|R|3|S|5|6|7|1M|8|@]|D|@]|E|$]]|$1|T|3|U|5|6|7|1N|8|@$9|1O|A|1P|B|J]]|D|@]|E|$]]|$1|V|3|W|5|6|7|1Q|8|@]|D|@]|E|$]]|$1|X|3|Y|5|6|7|1R|8|@]|D|@]|E|$]]|$1|Z|3|10|5|11|7|1S|8|@$9|1T|A|1U|B|J]|$9|1V|A|1W|B|J]]|D|@]|E|$]]|$1|12|3|13|5|11|7|1X|8|@$9|1Y|A|1Z|B|J]]|D|@]|E|$]]|$1|14|3|-4|5|6|7|20|8|@]|D|@]|E|$]]]|15|$]]

Taking patch's answer, making it a bit more general,

i.e.: skipping everything till the first digit.

<code>ifconfig eth0 | awk '/inet addr/{sub(/[^0-9]*/,""); print $1}'</code>

Or even better:

<code>ifconfig eth0 | awk '/inet /{sub(/[^0-9]*/,""); print $1}'</code>

<ul>
<li>Please note the print part at the end - changes from $2 to $1.</li>
</ul>

Using Perl Regex:

<code>ifconfig eth0 | grep -oP '(?&lt;= inet addr:)[^ ]+'</code>

Explanation: grep -oP searches for an EXACT match using Perl regex. 
The "tricky" part is the regex itself; 
1. <code>(?&lt;= inet addr:)</code> means - that the string <code>inet addr:</code> is to the LEFT of what we're looking for. 
2. <code>[^ ]+</code> (please notice the space after the ^ ) - it means to look for everything until the first blank - in our case it is the IP Address.

blocks|key|273773|text|使用：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|273774|ifconfig+enops3+%7C+grep+broadcast+%7C+cut+-d+"+"+-f10|code-block|syntax|javascript|273775|其中enops3是接口名。|offset|length|style|CODE|273776|entityMap^0|0|0|2|6|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Q|8|@$I|R|J|S|K|L]]|9|@]|A|$]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

Use:
<pre><code>ifconfig enops3 | grep broadcast | cut -d &quot; &quot; -f10
</code></pre>
Where <code>enops3</code> is the interface name.

blocks|key|273849|text|除了解析ifconfig之外，还有一种获取IP地址的简单方法。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|273850|hostname+-I+-I,+--all-ip-addresses+all+addresses+for+the+host+-i,+--ip-address++++++addresses+for+the+hostname|offset|length|style|CODE|273851|参考文献：http://linux.die.net/man/1/hostname|273852|示例：|BOLD|273853|ec2-user@terraform+~$+hostname+-I
10.10.10.10|blockquote|273854|entityMap|0|LINK|mutability|MUTABLE|url|http://linux.die.net/man/1/hostname^0|0|0|32|0|5|Z|0|0|0|3|0|0^^$0|@$1|2|3|4|5|6|7|X|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|Y|8|@$D|Z|E|10|F|G]]|9|@]|A|$]]|$1|H|3|I|5|6|7|11|8|@]|9|@$D|12|E|13|1|14]]|A|$]]|$1|J|3|K|5|6|7|15|8|@$D|16|E|17|F|L]]|9|@]|A|$]]|$1|M|3|N|5|O|7|18|8|@]|9|@]|A|$]]|$1|P|3|-4|5|6|7|19|8|@]|9|@]|A|$]]]|Q|$R|$5|S|T|U|A|$V|W]]]]

There is another easy way to get the IP address apart from parsing ifconfig.

<code>hostname -I
-I, --all-ip-addresses all addresses for the host
-i, --ip-address addresses for the hostname</code>

Ref: <a href="http://linux.die.net/man/1/hostname" rel="nofollow">http://linux.die.net/man/1/hostname</a>

Example:

<blockquote>
 [ec2-user@terraform ~]$ hostname -I 
 10.10.10.10
</blockquote>

blocks|key|2876348|text|此代码输出所有网络连接的IP地址(环回除外)，并在、mostOS和LinuxVersions之间进行移植。|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|2876349|对于运行在以下机器上的脚本，它特别有用：|2876350|活动网络适配器未知，|unordered-list-item|2876351|在Wi和以太网连接之间切换的笔记本，以及|2876352|具有多个网络连接的机器。|2876353|剧本是：|2876354|/sbin/ifconfig+-a+%7C+awk+'/(cast)/+{print+$2}'+%7C+cut+-d:+-f2|code-block|syntax|javascript|2876355|这可以分配给脚本中的一个变量，如下所示：|2876356|myip=$(/sbin/ifconfig+-a+%7C+awk+'/(cast)/+{print+$2}'+%7C+cut+-d:+-f2)|2876357|脚本可以通过使用循环处理结果来处理可能的多个地址，如下所示：|2876358|if+[[+-n+$myip+]];+then
++count=0
++for+i+in+$myip;+do
++++myips[count]=$i+++++++#+Or+process+as+desired
++++((%2B%2Bcount))
++done
++numIPaddresses=$count+++#+Optional+parameter,+if+wanted
fi|2876359|备注：|2876360|它在“强制转换”上过滤'ifconfig‘，因为这具有过滤掉环回地址的额外效果，同时也可以在大多数OS和Linux版本上工作。|2876361|最后的“剪切”函数对于Linux上的适当功能是必要的，而不是OS。然而，它不会影响OS的结果--因此，为了便于移植，就把它留在了这里。|2876362|entityMap^0|5|B|P|L|1E|3|0|0|K|0|0|A|0|0|K|0|0|C|0|0|4|0|0|0|K|0|0|0|U|0|0|0|3|0|0|1R|0|0|1V|0^^$0|@$1|2|3|4|5|6|7|1B|8|@$9|1C|A|1D|B|C]|$9|1E|A|1F|B|C]|$9|1G|A|1H|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|1I|8|@$9|1J|A|1K|B|C]]|D|@]|E|$]]|$1|H|3|I|5|J|7|1L|8|@$9|1M|A|1N|B|C]]|D|@]|E|$]]|$1|K|3|L|5|J|7|1O|8|@$9|1P|A|1Q|B|C]]|D|@]|E|$]]|$1|M|3|N|5|J|7|1R|8|@$9|1S|A|1T|B|C]]|D|@]|E|$]]|$1|O|3|P|5|6|7|1U|8|@$9|1V|A|1W|B|C]]|D|@]|E|$]]|$1|Q|3|R|5|S|7|1X|8|@]|D|@]|E|$T|U]]|$1|V|3|W|5|6|7|1Y|8|@$9|1Z|A|20|B|C]]|D|@]|E|$]]|$1|X|3|Y|5|S|7|21|8|@]|D|@]|E|$T|U]]|$1|Z|3|10|5|6|7|22|8|@$9|23|A|24|B|C]]|D|@]|E|$]]|$1|11|3|12|5|S|7|25|8|@]|D|@]|E|$T|U]]|$1|13|3|14|5|6|7|26|8|@$9|27|A|28|B|C]]|D|@]|E|$]]|$1|15|3|16|5|J|7|29|8|@$9|2A|A|2B|B|C]]|D|@]|E|$]]|$1|17|3|18|5|J|7|2C|8|@$9|2D|A|2E|B|C]]|D|@]|E|$]]|$1|19|3|-4|5|6|7|2F|8|@]|D|@]|E|$]]]|1A|$]]

This code outputs IP addresses for all network connections (except loopback) and is portable between most OS&nbsp;X and Linux versions.

It's particularly useful for scripts that run on machines where:

<ul>
<li>The active network adapter is unknown,</li>
<li>notebooks that switch between Wi-Fi and Ethernet connections, and</li>
<li>machines with multiple network connections.</li>
</ul>

The script is:

<pre><code>/sbin/ifconfig -a | awk '/(cast)/ {print $2}' | cut -d: -f2
</code></pre>

This can be assigned to a variable in a script like this:

<pre><code>myip=$(/sbin/ifconfig -a | awk '/(cast)/ {print $2}' | cut -d: -f2)
</code></pre>

Scripts can handle possible multiple addresses by using a loop to process the results, as so:

<pre><code>if [[ -n $myip ]]; then
 count=0
 for i in $myip; do
 myips[count]=$i # Or process as desired
 ((++count))
 done
 numIPaddresses=$count # Optional parameter, if wanted
fi
</code></pre>

Notes:

<ul>
<li>It filters 'ifconfig' on "cast", as this has an added effect of filtering out loopback addresses while also working on most OS&nbsp;X and Linux versions.</li>
<li>The final 'cut' function is necessary for proper function on Linux, but not OS&nbsp;X. However, it doesn't effect the OS&nbsp;X results - so it's left in for portability.</li>
</ul>

blocks|key|273907|text|一个简单的AWK+%2B+Bash脚本示例，它可能给出如何解析命令输出和将语法混合在一起的一般概念。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|273908|完整代码位于：https://gist.github.com/darkphase/67d7ec22d47dbebd329e|offset|length|273909|BEGIN+{+RS+=+""+;+FS+=+"\n"+}++#+Change+separator+characters
{
++++while+(+"'"$cmd"'"+%7C+getline+){
++++++++#+print+$0
++++++++if+(+$1+!~+/LOOPBACK/+){

++++++++++++split($1,arr,"+")
++++++++++++print+"'"$blue"'"arr[1]"'"$reset"'"

++++++++++++for(i+=+1;+i+<=+NF;+i%2B%2B)+{+#+Loop+through+fields+(this+case+lines)
++++++++++++++++split($i,arr,"+")
++++++++++++++++switch+(+arr[1]+)+{
++++++++++++++++++++case+"inet":
++++++++++++++++++++++++print+"'"$red"'"+"IPV4:"+"'"$reset"'"+"\n+IP:+"+"'"$yellow"'"+arr[2]+"'"$reset"'"+"\n+NM:+"arr[4]"\n+BC:+"arr[6]
++++++++++++++++++++++++break
++++++++++++++++++++case+"inet6":
++++++++++++++++++++++++print+"'"$red"'"+"IPV6:"+"'"$reset"'"+"\n+IP:+"arr[2]"\n+PL:+"arr[4]
++++++++++++++++++++++++break
++++++++++++++++++++case+"ether":
++++++++++++++++++++++++print+"'"$red"'"+"MAC:+"+"'"$reset"'"+arr[2]
++++++++++++++++++++++++break
++++++++++++++++++++default:
++++++++++++++++}
++++++++++++}
++++++++++++print+""
++++++++}
++++}
}'|code-block|syntax|javascript|273910|entityMap|0|LINK|mutability|MUTABLE|url|https://gist.github.com/darkphase/67d7ec22d47dbebd329e^0|0|7|1I|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|T|8|@]|9|@$D|U|E|V|1|W]]|A|$]]|$1|F|3|G|5|H|7|X|8|@]|9|@]|A|$I|J]]|$1|K|3|-4|5|6|7|Y|8|@]|9|@]|A|$]]]|L|$M|$5|N|O|P|A|$Q|R]]]]

A simple AWK + Bash script example which may give general idea how to parse command output and mix syntaxes together.

Full code is at: <a href="https://gist.github.com/darkphase/67d7ec22d47dbebd329e" rel="nofollow">https://gist.github.com/darkphase/67d7ec22d47dbebd329e</a>

<pre class="lang-awk prettyprint-override"><code>BEGIN { RS = "" ; FS = "\n" } # Change separator characters
{
 while ( "'"$cmd"'" | getline ){
 # print $0
 if ( $1 !~ /LOOPBACK/ ){

 split($1,arr," ")
 print "'"$blue"'"arr[1]"'"$reset"'"

 for(i = 1; i &lt;= NF; i++) { # Loop through fields (this case lines)
 split($i,arr," ")
 switch ( arr[1] ) {
 case "inet":
 print "'"$red"'" "IPV4:" "'"$reset"'" "\n IP: " "'"$yellow"'" arr[2] "'"$reset"'" "\n NM: "arr[4]"\n BC: "arr[6]
 break
 case "inet6":
 print "'"$red"'" "IPV6:" "'"$reset"'" "\n IP: "arr[2]"\n PL: "arr[4]
 break
 case "ether":
 print "'"$red"'" "MAC: " "'"$reset"'" arr[2]
 break
 default:
 }
 }
 print ""
 }
 }
}'
</code></pre>

blocks|key|2876413|text|使用IPv4示例使用BASH4%2B|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|2876414|示例1，使用主机名：|2876415|++hostname+-I%7Ccut+-d"+"+-f+1|code-block|syntax|javascript|2876416|示例2，设备是已知的(并且它永远不会改变)：|2876417|++ifconfig+ens5+%7C+grep+"inet"+%7C+awk+'{print+$2}'+%7C++sed+'s/[%5E0-9.]*//g'|2876418|示例3，现在不要使用设备(例如eth0、eth1、enp0s23或wpxxx)：|2876419|+ip+a+%7C+awk+'BEGIN{+"hostname+-I%7Ccut+-d\"+\"+-f+1"+%7C+getline+ip}+$2+~+ip+{print+"Device:+"$NF+"++IP:+"$2}'|2876420|示例4，需要网络IP地址：|2876421|+wget+-q+-O+/dev/stdout+http://checkip.dyndns.org/+%7C+cut+-d":"+-f2+%7C+cut+-d+\<+-f1|2876422|好好享受吧。|2876423|entityMap^0|2|E|0|0|3|0|0|0|M|0|0|0|14|0|0|0|D|0|0|0|6|0^^$0|@$1|2|3|4|5|6|7|12|8|@$9|13|A|14|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|15|8|@$9|16|A|17|B|C]]|D|@]|E|$]]|$1|H|3|I|5|J|7|18|8|@]|D|@]|E|$K|L]]|$1|M|3|N|5|6|7|19|8|@$9|1A|A|1B|B|C]]|D|@]|E|$]]|$1|O|3|P|5|J|7|1C|8|@]|D|@]|E|$K|L]]|$1|Q|3|R|5|6|7|1D|8|@$9|1E|A|1F|B|C]]|D|@]|E|$]]|$1|S|3|T|5|J|7|1G|8|@]|D|@]|E|$K|L]]|$1|U|3|V|5|6|7|1H|8|@$9|1I|A|1J|B|C]]|D|@]|E|$]]|$1|W|3|X|5|J|7|1K|8|@]|D|@]|E|$K|L]]|$1|Y|3|Z|5|6|7|1L|8|@$9|1M|A|1N|B|C]]|D|@]|E|$]]|$1|10|3|-4|5|6|7|1O|8|@]|D|@]|E|$]]]|11|$]]

IPv4 Examples using BASH4+

Example 1, using hostname:

<pre><code> hostname -I|cut -d" " -f 1
</code></pre>

Example 2, the device is known (and it never changes) :

<pre><code> ifconfig ens5 | grep "inet" | awk '{print $2}' | sed 's/[^0-9.]*//g'
</code></pre>

Example 3, don't now the device (e.g. eth0, eth1, enp0s23, or wpxxx) :

<pre><code> ip a | awk 'BEGIN{ "hostname -I|cut -d\" \" -f 1" | getline ip} $2 ~ ip {print "Device: "$NF " IP: "$2}'
</code></pre>

Example 4, want the network IP address:

<pre><code> wget -q -O /dev/stdout http://checkip.dyndns.org/ | cut -d":" -f2 | cut -d \&lt; -f1
</code></pre>

enjoy.

blocks|key|1879427|text|在尝试了一些解决方案之后，我发现这非常方便，将其添加到您的别名中：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1879428|alias+iconfig='ifconfig+%7C+awk+'\''{if+(+$1+>=+"en"+&&+$2+>=+"flags"+&&+$3+==+"mtu")+{print+$1};+if+(+$1+==+"inet"+%7C%7C+$1+==+"status:"){print+$0};}'\''%7Cegrep+"en%7Clo%7Cinet"'|code-block|syntax|javascript|1879429|输出如下所示：|1879430|shady@Shadys-MacBook-Pro:xxxx/xxx+‹dev*›$+iconfig+lo0:+++++inet+127.0.0.1+netmask+0xff000000++en0:+++++inet+10.16.27.115+netmask+0xffffff00+broadcast+10.16.27.255+en1:+en2:+en5:+++++inet+192.168.2.196+netmask+0xffffff00+broadcast+192.168.2.255|offset|length|style|CODE|1879431|entityMap^0|0|0|0|0|6R|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|S|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|T|8|@$K|U|L|V|M|N]]|9|@]|A|$]]|$1|O|3|-4|5|6|7|W|8|@]|9|@]|A|$]]]|P|$]]

After trying some solutions i find this most handy,
add this to your alias:

<pre><code>alias iconfig='ifconfig | awk '\''{if ( $1 &gt;= "en" &amp;&amp; $2 &gt;= "flags" &amp;&amp; $3 == "mtu") {print $1}; if ( $1 == "inet" || $1 == "status:"){print $0};}'\''|egrep "en|lo|inet"'
</code></pre>

the output looks like this:

<code>shady@Shadys-MacBook-Pro:xxxx/xxx ‹dev*›$ iconfig
lo0:
 inet 127.0.0.1 netmask 0xff000000 
en0:
 inet 10.16.27.115 netmask 0xffffff00 broadcast 10.16.27.255
en1:
en2:
en5:
 inet 192.168.2.196 netmask 0xffffff00 broadcast 192.168.2.255</code>

blocks|key|2876544|text|这是获取IP地址的更“不可知论”的方法，而不管您的*nix系统(Mac，Linux)、接口名称，甚至您的地区配置：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2876545|ifconfig+%7C+grep+-E+"([0-9]{1,3}\.){3}[0-9]{1,3}"+%7C+grep+-v+127.0.0.1+%7C+awk+'{+print+$2+}'+%7C+cut+-f2+-d:|code-block|syntax|javascript|2876546|如果您有一个以上的活动IP，将列出每一个分隔行。如果只想获得第一个IP，请将%7C+head+-n1添加到表达式中：|offset|length|style|CODE|2876547|ifconfig+%7C+grep+-E+"([0-9]{1,3}\.){3}[0-9]{1,3}"+\
+++++%7C+grep+-v+127.0.0.1+%7C+awk+'{+print+$2+}'+%7C+cut+-f2+-d:+%7C+head+-n1|2876548|如果您想要特定接口的IP地址，请将第一个表达式ifconfig替换为ifconfig+INTERFACENAME，例如ifconfig+eth0+%7C+grep+-E+...。|2876549|最后，您注意到脚本所做的事情之一是省略由sysadmins和开发人员调用的IP+127.0.0.1+"localhost"，但是要考虑到一些应用程序也可能添加一个IP的虚拟网络设备，如果没有添加到省略列表中，该IP可能是返回的。Docker添加了一个通常具有IP+172.17.0.1的虚拟接口172.17.0.1，如果您想省略这个IP以及"localhost“，请将表达式grep+-v+127.0.0.1更改为考虑到另一个IP。在这种情况下(省略localhost和docker)，最终表达式将是：|2876550|ifconfig+%7C+grep+-E+"([0-9]{1,3}\.){3}[0-9]{1,3}"+%7C+grep+-v+'[127.0%7C172.17].0.1'+%7C+awk+'{+print+$2+}'+%7C+cut+-f2+-d:+%7C+head+-n1|2876551|以下是本页中提到的一些在某些情况下失败的示例，以及原因：|2876552|ip+route+...：ip命令没有安装在OSX机器上。|unordered-list-item|2876553|hostname+-I：-I选项在OSX中无效。|2876554|ifconfig+en0+...：在Linux和OSX中，接口名(eth0、en0)是不同的，而在Linux中，接口名称也取决于接口类型(以太网连接的ethX，无线的wlanX等等)。|2876555|python+-c+'import+socket;+print(socket.gethostbyname(socket.gethostname()))'：这让我在UbuntuLinux14.04中获得了127.0.1.1+(一个回环IP)，因此无法工作。|2876556|ifconfig+%7C+grep+'inet+addr:'+%7C+grep+-v+127.0.0.1+%7C+head+-n1+%7C+cut+-f2+-d:+%7C+cut+-f1+-d+'+'：Geograph的文章比较接近，但在一些没有配置LANG=en的Linux发行版中不能工作，因为grep查找的文本inet+addr:在其他区域中是用不同的文本输出的，而在Mac中，这个标签也是不同的。|2876557|entityMap^0|0|0|12|A|0|0|N|8|Y|M|1N|R|0|14|9|3O|A|43|A|57|H|0|0|0|0|C|D|2|0|0|B|C|2|0|0|G|X|4|12|3|0|0|24|2T|9|0|0|2I|37|7|3V|4|44|A|0^^$0|@$1|2|3|4|5|6|7|19|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|1A|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|1B|8|@$I|1C|J|1D|K|L]]|9|@]|A|$]]|$1|M|3|N|5|D|7|1E|8|@]|9|@]|A|$E|F]]|$1|O|3|P|5|6|7|1F|8|@$I|1G|J|1H|K|L]|$I|1I|J|1J|K|L]|$I|1K|J|1L|K|L]]|9|@]|A|$]]|$1|Q|3|R|5|6|7|1M|8|@$I|1N|J|1O|K|L]|$I|1P|J|1Q|K|L]|$I|1R|J|1S|K|L]|$I|1T|J|1U|K|L]]|9|@]|A|$]]|$1|S|3|T|5|D|7|1V|8|@]|9|@]|A|$E|F]]|$1|U|3|V|5|6|7|1W|8|@]|9|@]|A|$]]|$1|W|3|X|5|Y|7|1X|8|@$I|1Y|J|1Z|K|L]|$I|20|J|21|K|L]]|9|@]|A|$]]|$1|Z|3|10|5|Y|7|22|8|@$I|23|J|24|K|L]|$I|25|J|26|K|L]]|9|@]|A|$]]|$1|11|3|12|5|Y|7|27|8|@$I|28|J|29|K|L]|$I|2A|J|2B|K|L]|$I|2C|J|2D|K|L]]|9|@]|A|$]]|$1|13|3|14|5|Y|7|2E|8|@$I|2F|J|2G|K|L]|$I|2H|J|2I|K|L]]|9|@]|A|$]]|$1|15|3|16|5|Y|7|2J|8|@$I|2K|J|2L|K|L]|$I|2M|J|2N|K|L]|$I|2O|J|2P|K|L]|$I|2Q|J|2R|K|L]]|9|@]|A|$]]|$1|17|3|-4|5|6|7|2S|8|@]|9|@]|A|$]]]|18|$]]

This is the more &quot;agnostic&quot; way to get the IP address, regardless of you *nix system (Mac OS, Linux), interface name, and even your locale configuration:
<pre><code>ifconfig | grep -E &quot;([0-9]{1,3}\.){3}[0-9]{1,3}&quot; | grep -v 127.0.0.1 | awk '{ print $2 }' | cut -f2 -d:
</code></pre>
If you have more than one active IP, will listed each one in a separated line. If you want just the first IP, add <code>| head -n1</code> to the expression:
<pre><code>ifconfig | grep -E &quot;([0-9]{1,3}\.){3}[0-9]{1,3}&quot; \
 | grep -v 127.0.0.1 | awk '{ print $2 }' | cut -f2 -d: | head -n1
</code></pre>
And if you want the IP address of a specific interface, replace the first expression <code>ifconfig</code> by <code>ifconfig INTERFACENAME</code>, for example <code>ifconfig eth0 | grep -E ... </code>.
Finally, you noticed that one of the things the script does is to omit the IP <code>127.0.0.1</code> called by sysadmins and developers &quot;localhost&quot;, but take into account that some applications may also add virtual network devices with an IP that may be the one returned if is not added to the omit list, eg. Docker adds a virtual interface <code>docker0</code> that usually has the IP <code>172.17.0.1</code>, if you want to omit this IP along with the &quot;localhost&quot; one, change the expression <code>grep -v 127.0.0.1</code> to take into account the another IP. In this case (omit localhost and docker) the final expression will be:
<pre><code>ifconfig | grep -E &quot;([0-9]{1,3}\.){3}[0-9]{1,3}&quot; | grep -v '[127.0|172.17].0.1' | awk '{ print $2 }' | cut -f2 -d: | head -n1
</code></pre>
These are some examples mentioned in this page that fails in some circumstances and why:
<ul>
<li><code>ip route ...</code>: the <code>ip</code> command isn't installed in OSX machines.</li>
<li><code>hostname -I</code>: the <code>-I</code> option is invalid in OSX.</li>
<li><code>ifconfig en0 ...</code>: the interfaces names (<code>eth0</code>, <code>en0</code>) are different in Linux and OSX, and in Linux the name depends also of the interface type (ethX for ethernet connection, wlanX for wireless, etc.).</li>
<li><code>python -c 'import socket; print(socket.gethostbyname(socket.gethostname()))'</code>: this got me <code>127.0.1.1</code> (a loopback IP) in Ubuntu Linux 14.04, so doesn't work.</li>
<li><code>ifconfig | grep 'inet addr:' | grep -v 127.0.0.1 | head -n1 | cut -f2 -d: | cut -f1 -d ' '</code>: the Geograph's post is the more close, but doesn't work in some Linux distributions without <code>LANG=en</code> configured, because the text <code>inet addr:</code> that <code>grep</code> looks for is output with a different text in other locales, and in Mac OS that label is also different.</li>
</ul>

blocks|key|2876577|text|你也可以试试这个|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2876578|user@linux:~$+cat+script.sh
ifconfig+%7C+grep+ad.*Bc+%7C+cut+-d:+-f2+%7C+awk+'{+print+$1}'
user@linux:~$+|code-block|syntax|javascript|2876579|输出|2876580|user@linux:~$+./script.sh
192.168.1.1
10.0.1.1
user@linux:~$|2876581|请注意，根据您的linux版本，ifconfig输出可能有所不同。因此，您可能希望相应地更改脚本。|2876582|顺便说一下，这是我的ifconfig输出|2876583|user@linux:~$+ifconfig+
eth0++++++Link+encap:Ethernet++HWaddr+00:00:00:00:00:10++
++++++++++inet+addr:192.168.1.1++Bcast:192.168.56.255++Mask:255.255.255.0
++++++++++UP+BROADCAST+RUNNING+MULTICAST++MTU:1500++Metric:1
++++++++++RX+packets:112+errors:0+dropped:0+overruns:0+frame:0
++++++++++TX+packets:93+errors:0+dropped:0+overruns:0+carrier:0
++++++++++collisions:0+txqueuelen:1000+
++++++++++RX+bytes:14616+(14.2+KiB)++TX+bytes:17776+(17.3+KiB)

eth1++++++Link+encap:Ethernet++HWaddr+00:00:00:00:00:11
++++++++++inet+addr:10.0.1.1++Bcast:10.0.1.255++Mask:255.255.255.0
++++++++++UP+BROADCAST+RUNNING+MULTICAST++MTU:1500++Metric:1
++++++++++RX+packets:0+errors:0+dropped:0+overruns:0+frame:0
++++++++++TX+packets:0+errors:0+dropped:0+overruns:0+carrier:0
++++++++++collisions:0+txqueuelen:1000+
++++++++++RX+bytes:0+(0.0+B)++TX+bytes:0+(0.0+B)

user@linux:~$|2876584|entityMap^0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|U|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|V|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|W|8|@]|9|@]|A|$]]|$1|M|3|N|5|6|7|X|8|@]|9|@]|A|$]]|$1|O|3|P|5|D|7|Y|8|@]|9|@]|A|$E|F]]|$1|Q|3|-4|5|6|7|Z|8|@]|9|@]|A|$]]]|R|$]]

You can also try this

<pre><code>user@linux:~$ cat script.sh
ifconfig | grep ad.*Bc | cut -d: -f2 | awk '{ print $1}'
user@linux:~$ 
</code></pre>

Output

<pre><code>user@linux:~$ ./script.sh
192.168.1.1
10.0.1.1
user@linux:~$
</code></pre>

Please take note that ifconfig output might be different depending on your linux version. Hence, you might want to change the script accordingly.

Btw, this is my ifconfig output

<pre><code>user@linux:~$ ifconfig 
eth0 Link encap:Ethernet HWaddr 00:00:00:00:00:10 
 inet addr:192.168.1.1 Bcast:192.168.56.255 Mask:255.255.255.0
 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
 RX packets:112 errors:0 dropped:0 overruns:0 frame:0
 TX packets:93 errors:0 dropped:0 overruns:0 carrier:0
 collisions:0 txqueuelen:1000 
 RX bytes:14616 (14.2 KiB) TX bytes:17776 (17.3 KiB)

eth1 Link encap:Ethernet HWaddr 00:00:00:00:00:11
 inet addr:10.0.1.1 Bcast:10.0.1.255 Mask:255.255.255.0
 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
 RX packets:0 errors:0 dropped:0 overruns:0 frame:0
 TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
 collisions:0 txqueuelen:1000 
 RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)

user@linux:~$
</code></pre>

blocks|key|2876622|text|在遇到ifconfig问题之后，我找到了一个包装库来简化我的生活。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|2876623|pip+install+my_ip+
mip|code-block|syntax|javascript|2876624|entityMap^0|3|8|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|P|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|Q|8|@]|D|@]|E|$]]]|L|$]]

After troubles with greping <code>ifconfig</code> I found a wrapper library to simplify my life
<pre><code>pip install my_ip 
mip
</code></pre>

I want to edit the bashrc file to have a simple function called "myip" to run. As you might guess, the function myip prints only my internal IP address of my machine.

The far as I got working, this is the script:

<pre><code>ifconfig en1 | awk '{ print $2}' | sort
</code></pre>

Which got my this output:

<pre><code>10.0.0.12
options=1&lt;PERFORMNUD&gt;
flags=8863&lt;UP,BROADCAST,SMART,RUNNING,SIMPLEX,MULTICAST&gt;
fe80::daa2:5eff:fe96:ba2f%en1
d8:a2:5e:96:ba:2f
autoselect
active
</code></pre>

I'm working on Mac&nbsp;OS&nbsp;X.

How can I get this done?

Parse ifconfig to get only my IP address using Bash

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我希望编辑bashrc文件，以便运行一个名为"myip“的简单函数。正如您可能猜到的，myip函数只打印我的机器的内部IP地址。在我开始工作的时候，这就是剧本：ifconfig en1 | awk '{ print $2}' | sort得到了我的输出：10.0.0.12options=1<PERFORMNUD>fla...

问解析ifconfig，仅使用Bash获取我的IP地址
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问解析ifconfig，仅使用Bash获取我的IP地址
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