blocks|key|3510054|text|你能试一下吗。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3510055|awk+'/DOCKER_HOST/+&&+match($0,/[0-9]%2B\.[0-9]%2B\.[0-9]%2B\.[0-9]%2B/){print+substr($0,RSTART,RLENGTH)}'+Input_file|code-block|syntax|javascript|3510056|解释：添加对上述代码的解释。|offset|length|style|BOLD|3510057|awk+'+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++##Starting+awk+program+from+here.
/DOCKER_HOST/+&&+match($0,/[0-9]%2B\.[0-9]%2B\.[0-9]%2B\.[0-9]%2B/){++++++##Checking+condition+if+string+DOCKER_HOST+is+found+in+line+AND+match+is+having+a+mentioned+regex+matched+in+it.
++print+substr($0,RSTART,RLENGTH)+++++++++++++++++++++++++++++++++##If+above+conditions+are+TRUE+then+printing+substring+whose+starting+index+is+RSTART+and+ending+index+is+RLENGTH.
}
'+Input_file++++++++++++++++++++++++++++++++++++++++++++++++++++++##Mentioning+Input_file+name+here.|3510058|3510059|3510060|第二个解决方案：考虑到您的Input_file总是相同的，然后尝试如下。|3510061|awk+-F'[/:]'+'/DOCKER_HOST/{print+$4}'+Input_file|3510062|3510063|awk+-F'[/:]'+'++++++##Starting+awk+program+from+here+and+setting+field+separator+as+/or+colon+here.
/DOCKER_HOST/{++++++##Checking+condition+if+a+line+has+string+DOCKER_HOST+then+do+following.
++print+$4++++++++++##Printing+4th+field+of+current+line.
}
'+Input_file++++++++##Mentioning+Input_file+name+here.|3510064|3510065|3510066|第三种解决方案：A+sed溶液。|CODE|3510067|sed+-n+'/DOCKER_HOST/s/.*\///;s/:.*//p'++Input_file|3510068|Explanation:以下仅供解释之用。|3510069|sed+-n+'++++++++++##Starting+sed+program+from+here+and+making+printing+off+for+all+lines+until+specifically+mentioned.
/DOCKER_HOST/+++++##Searching+string+DOCKER_HOST+in+lines+if+present+then+do+following.
s/++++++++++++++++##s+means+perform+substitution+operation+here.
.*\/++++++++++++++##mentioning+regex+which+covers+everything+till+/+in+line,+if+matched+this+regex
//++++++++++++++++##Then+substitute+it+with+NULL+here.
;+++++++++++++++++##semi+colon+denotes+to+segregate+another+substitute+operation+after+this+one.
s/++++++++++++++++##Doing+substitution+from+here.
:.*+++++++++++++++##Match+everything+from+:+to+till+last+of+line.
//++++++++++++++++##Substitute+above+matched+values+with+NULL+in+current+line.
p+++++++++++++++++##p+means+only+print+this+line.
'++Input_file+++++##Mentioning+Input_file+name+here.|3510070|entityMap^0|0|0|0|3|0|0|0|0|0|8|0|0|0|3|0|0|0|0|0|8|A|3|0|0|0|C|0|0^^$0|@$1|2|3|4|5|6|7|1A|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|1B|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|1C|8|@$I|1D|J|1E|K|L]]|9|@]|A|$]]|$1|M|3|N|5|D|7|1F|8|@]|9|@]|A|$E|F]]|$1|O|3|-4|5|6|7|1G|8|@]|9|@]|A|$]]|$1|P|3|-4|5|6|7|1H|8|@]|9|@]|A|$]]|$1|Q|3|R|5|6|7|1I|8|@$I|1J|J|1K|K|L]]|9|@]|A|$]]|$1|S|3|T|5|D|7|1L|8|@]|9|@]|A|$E|F]]|$1|U|3|H|5|6|7|1M|8|@$I|1N|J|1O|K|L]]|9|@]|A|$]]|$1|V|3|W|5|D|7|1P|8|@]|9|@]|A|$E|F]]|$1|X|3|-4|5|6|7|1Q|8|@]|9|@]|A|$]]|$1|Y|3|-4|5|6|7|1R|8|@]|9|@]|A|$]]|$1|Z|3|10|5|6|7|1S|8|@$I|1T|J|1U|K|L]|$I|1V|J|1W|K|11]]|9|@]|A|$]]|$1|12|3|13|5|D|7|1X|8|@]|9|@]|A|$E|F]]|$1|14|3|15|5|6|7|1Y|8|@$I|1Z|J|20|K|L]]|9|@]|A|$]]|$1|16|3|17|5|D|7|21|8|@]|9|@]|A|$E|F]]|$1|18|3|-4|5|6|7|22|8|@]|9|@]|A|$]]]|19|$]]

Could you please try following.

<pre><code>awk '/DOCKER_HOST/ &amp;&amp; match($0,/[0-9]+\.[0-9]+\.[0-9]+\.[0-9]+/){print substr($0,RSTART,RLENGTH)}' Input_file
</code></pre>

Explanation: Adding explanation for above code.

<pre><code>awk ' ##Starting awk program from here.
/DOCKER_HOST/ &amp;&amp; match($0,/[0-9]+\.[0-9]+\.[0-9]+\.[0-9]+/){ ##Checking condition if string DOCKER_HOST is found in line AND match is having a mentioned regex matched in it.
 print substr($0,RSTART,RLENGTH) ##If above conditions are TRUE then printing substring whose starting index is RSTART and ending index is RLENGTH.
}
' Input_file ##Mentioning Input_file name here.
</code></pre>

<hr>

<hr>

2nd solution: Considering that your Input_file will always be same then try following.

<pre><code>awk -F'[/:]' '/DOCKER_HOST/{print $4}' Input_file
</code></pre>

Explanation: Adding explanation for above code.

<pre><code>awk -F'[/:]' ' ##Starting awk program from here and setting field separator as /or colon here.
/DOCKER_HOST/{ ##Checking condition if a line has string DOCKER_HOST then do following.
 print $4 ##Printing 4th field of current line.
}
' Input_file ##Mentioning Input_file name here.
</code></pre>

<hr>

<hr>

3rd solution: A <code>sed</code> solution.

<pre><code>sed -n '/DOCKER_HOST/s/.*\///;s/:.*//p' Input_file
</code></pre>

Explanation: Following is only for explanation purposes.

<pre><code>sed -n ' ##Starting sed program from here and making printing off for all lines until specifically mentioned.
/DOCKER_HOST/ ##Searching string DOCKER_HOST in lines if present then do following.
s/ ##s means perform substitution operation here.
.*\/ ##mentioning regex which covers everything till / in line, if matched this regex
// ##Then substitute it with NULL here.
; ##semi colon denotes to segregate another substitute operation after this one.
s/ ##Doing substitution from here.
:.* ##Match everything from : to till last of line.
// ##Substitute above matched values with NULL in current line.
p ##p means only print this line.
' Input_file ##Mentioning Input_file name here.
</code></pre>

blocks|key|1541928|text|假设给定现有代码，IP地址是您拥有//的唯一位置|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1541929|$+awk+'sub(/.*\/\//,""){sub(/:.*/,"");+print}'+file
192.168.99.100|code-block|syntax|javascript|1541930|或作其他假设.|1541931|$+awk+-F'//%7C:'+'NF>2{print+$3}'+file
192.168.99.100|1541932|或者：|1541933|$+awk+-F'//%7C:'+'/DOCKER_HOST=/{print+$3}'+file
192.168.99.100|1541934|或者..。|1541935|这实际上取决于该文件中的其他内容，以及您希望它有多健壮。|1541936|entityMap^0|H|2|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Y|8|@$9|Z|A|10|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|11|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|12|8|@]|D|@]|E|$]]|$1|M|3|N|5|H|7|13|8|@]|D|@]|E|$I|J]]|$1|O|3|P|5|6|7|14|8|@]|D|@]|E|$]]|$1|Q|3|R|5|H|7|15|8|@]|D|@]|E|$I|J]]|$1|S|3|T|5|6|7|16|8|@]|D|@]|E|$]]|$1|U|3|V|5|6|7|17|8|@]|D|@]|E|$]]|$1|W|3|-4|5|6|7|18|8|@]|D|@]|E|$]]]|X|$]]

Assuming given your existing code that the IP address is the only place you have <code>//</code>:

<pre><code>$ awk 'sub(/.*\/\//,""){sub(/:.*/,""); print}' file
192.168.99.100
</code></pre>

or making other assumptions...:

<pre><code>$ awk -F'//|:' 'NF&gt;2{print $3}' file
192.168.99.100
</code></pre>

or:

<pre><code>$ awk -F'//|:' '/DOCKER_HOST=/{print $3}' file
192.168.99.100
</code></pre>

or ....

It really just depends what else is in that file and how robust you want it to be.

I have a file called LogsDocker that contains 

<pre><code>export DOCKER_TLS_VERIFY="1"
export DOCKER_HOST="tcp://192.168.99.100:2376"
export DOCKER_CERT_PATH="/root/.docker/machine/machines/Main-hola"
export DOCKER_MACHINE_NAME="Main-hola"
# Run this command to configure your shell: 
# eval $(docker-machine env Main-hola)
</code></pre>

and i want to print only the ip 

<pre><code>192.168.99.100
</code></pre>

Just discovered Awk and with the command 

<pre><code> awk 'BEGIN { FS = "//"} ; { print $2}' LogsDocker
</code></pre>

made it print (with a bunch of empty lines)

<pre><code>
192.168.99.100:2376"




</code></pre>

What would be the correct way to print ONLY the ip without empty lines

Make awk print a specific segment of a single line

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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我有一个名为LogsDocker的文件export DOCKER_TLS_VERIFY="1"export DOCKER_HOST="tcp://192.168.99.100:2376"export DOCKER_CERT_PATH="/root/.docker/machine/machines/Main-hola"e...

问使awk打印单行的特定段
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