blocks|key|592648|text|对于grep，-C是直接前进的选项。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|592649|关于第二个问题，试试这个！|592650|sed+-n+"100000,20000p"+bar.txt+>+foo.txt+|code-block|syntax|javascript|592651|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|L|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|M|8|@]|9|@]|A|$G|H]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

for grep -C is the straight forward option 

for the 2nd question try this!

<pre><code>sed -n "100000,20000p" bar.txt &gt; foo.txt 
</code></pre>

blocks|key|2146083|text|您需要查看grep的-A+-B和-C选项。有关更多信息，请参见man+grep|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|2146084|+++-A+NUM,+--after-context=NUM
++++++++++Print++NUM++lines++of++trailing++context++after++matching+lines.
++++++++++Places++a++line++containing++--++between++contiguous++groups++of
++++++++++matches.

+++-B+NUM,+--before-context=NUM
++++++++++Print+NUM++lines++of++leading++context++before++matching++lines.
++++++++++Places++a++line++containing++--++between++contiguous++groups++of
++++++++++matches.

+++-C+NUM,+--context=NUM
++++++++++Print++NUM+lines+of+output+context.++Places+a+line+containing+--
++++++++++between+contiguous+groups+of+matches.|code-block|syntax|javascript|2146085|要重定向输出，请执行以下操作：grep+"your+pattern"+yourinputfile+>+/tmp/testout|2146086|entityMap^0|V|8|0|0|F|1C|0^^$0|@$1|2|3|4|5|6|7|O|8|@$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|R|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|S|8|@$9|T|A|U|B|C]]|D|@]|E|$]]|$1|M|3|-4|5|6|7|V|8|@]|D|@]|E|$]]]|N|$]]

You want to look into the -A -B and -C options of grep. See <code>man grep</code> for more information

<pre><code> -A NUM, --after-context=NUM
 Print NUM lines of trailing context after matching lines.
 Places a line containing -- between contiguous groups of
 matches.

 -B NUM, --before-context=NUM
 Print NUM lines of leading context before matching lines.
 Places a line containing -- between contiguous groups of
 matches.

 -C NUM, --context=NUM
 Print NUM lines of output context. Places a line containing --
 between contiguous groups of matches.
</code></pre>

For redirecting the output, do the following: <code>grep "your pattern" yourinputfile &gt; /tmp/testout</code>

blocks|key|1790992|text|参见head和/或tail。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1790993|例如：|1790994|head+-n+20000+<input>+%7C+tail+-n+10000+>+/tmp/testout|code-block|syntax|javascript|1790995|而尾部的论点是(20000+-+10000)。|1790996|entityMap^0|2|4|9|4|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@$9|R|A|S|B|C]|$9|T|A|U|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|V|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|W|8|@]|D|@]|E|$K|L]]|$1|M|3|N|5|6|7|X|8|@]|D|@]|E|$]]|$1|O|3|-4|5|6|7|Y|8|@]|D|@]|E|$]]]|P|$]]

See <code>head</code> and/or <code>tail</code>.

For example:

<pre><code>head -n 20000 &lt;input&gt; | tail -n 10000 &gt; /tmp/testout
</code></pre>

whereas the argument of tail is (20000 - 10000).

blocks|key|2146048|text|如果使用grep，可以提供-B和-A，以便在与grep匹配之前和之后获得行。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|2146049|例如。|2146050|grep+-B+5+-A+10+SearchString+File|code-block|syntax|javascript|2146051|将打印每一行匹配的SearchString文件加5行之前和10行后的匹配线。|2146052|在你的问题的另一部分，你可以使用头/尾或sed。详情请参阅其他答案。|2146053|entityMap|0|LINK|mutability|MUTABLE|url|http://unixhelp.ed.ac.uk/CGI/man-cgi?grep^0|D|2|G|2|N|4|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Y|8|@$9|Z|A|10|B|C]|$9|11|A|12|B|C]]|D|@$9|13|A|14|1|15]]|E|$]]|$1|F|3|G|5|6|7|16|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|17|8|@]|D|@]|E|$K|L]]|$1|M|3|N|5|6|7|18|8|@]|D|@]|E|$]]|$1|O|3|P|5|6|7|19|8|@]|D|@]|E|$]]|$1|Q|3|-4|5|6|7|1A|8|@]|D|@]|E|$]]]|R|$S|$5|T|U|V|E|$W|X]]]]

If you're using GNU grep, you can supply <code>-B</code> and <code>-A</code> to get lines before and after the match with <a href="http://unixhelp.ed.ac.uk/CGI/man-cgi?grep" rel="nofollow">grep</a>. 

E.g.

<pre><code>grep -B 5 -A 10 SearchString File
</code></pre>

will give print each line matching SearchString from File plus 5 lines before and 10 lines after the matching line. 

For the other part of your question, you can use head/tail or sed. Please see other answers for details.

blocks|key|1791098|text|对于第2部分，awk将允许您打印一系列行，因此：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1791099|awk+'NR==10000,NR==20000{print}{}'+inputfile.txt+>/tmp/testout|code-block|syntax|javascript|1791100|这基本上给出了一个基于记录编号NR的范围。|1791101|对于第1部分，来自grep的上下文可以使用--after-context=X和--before-context=X开关获得。如果您正在运行一个不允许这样做的grep，您可以根据上面第2部分的答案来伪造一个awk脚本。|1791102|entityMap^0|7|3|0|0|F|2|0|9|4|L|H|13|I|26|4|2U|3|0^^$0|@$1|2|3|4|5|6|7|Q|8|@$9|R|A|S|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|T|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|U|8|@$9|V|A|W|B|C]]|D|@]|E|$]]|$1|M|3|N|5|6|7|X|8|@$9|Y|A|Z|B|C]|$9|10|A|11|B|C]|$9|12|A|13|B|C]|$9|14|A|15|B|C]|$9|16|A|17|B|C]]|D|@]|E|$]]|$1|O|3|-4|5|6|7|18|8|@]|D|@]|E|$]]]|P|$]]

For part 2, <code>awk</code> will allow you to print a range of lines thus:

<pre><code>awk 'NR==10000,NR==20000{print}{}' inputfile.txt &gt;/tmp/testout
</code></pre>

This basically gives a range based on the record number <code>NR</code>.

For part 1, context from <code>grep</code> can be obtained using the <code>--after-context=X</code> and <code>--before-context=X</code> switches. If you're running a <code>grep</code> that doesn't allow that, you can dummy up an <code>awk</code> script based on the part 2 answer above.

blocks|key|1791111|text|查看前后：(前3行，后3行)|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1791112|grep+-C3+foo+bar.txt|code-block|syntax|javascript|1791113|第二个问题是：|1791114|head+-20000+bar.txt+%7C+tail+-10000+>+foo.txt|1791115|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|$]]

to see the before and after: (3 lines before and 3 lines after)

<pre><code>grep -C3 foo bar.txt
</code></pre>

the second question:

<pre><code>head -20000 bar.txt | tail -10000 &gt; foo.txt
</code></pre>

blocks|key|2146202|text|您只需使用awk就可以完成这些操作，如在"6“前后显示2行，显示范围从linenumber+4到8。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2146203|$+cat+file
1
2
3
4
5
6
7
8
9
10

$+awk+'c--&&c>=0{print+"2+numbers+below+6:+"$0};/6/{c=2;for(i=d;i>d-2;i--)print+"2+numbers+above+6:+"a[i];delete+a}{a[%2B%2Bd]=$0}+NR>3&&NR<9{print+"With+range:+->"$0}'+file
With+range:+->4
With+range:+->5
2+numbers+above+6:+5
2+numbers+above+6:+4
With+range:+->6
2+numbers+below+6:+7
With+range:+->7
2+numbers+below+6:+8
With+range:+->8|code-block|syntax|javascript|2146204|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|$]]

you can do these with just awk, eg display 2 lines before and after "6", and display range from linenumber 4 to 8

<pre><code>$ cat file
1
2
3
4
5
6
7
8
9
10

$ awk 'c--&amp;&amp;c&gt;=0{print "2 numbers below 6: "$0};/6/{c=2;for(i=d;i&gt;d-2;i--)print "2 numbers above 6: "a[i];delete a}{a[++d]=$0} NR&gt;3&amp;&amp;NR&lt;9{print "With range: -&gt;"$0}' file
With range: -&gt;4
With range: -&gt;5
2 numbers above 6: 5
2 numbers above 6: 4
With range: -&gt;6
2 numbers below 6: 7
With range: -&gt;7
2 numbers below 6: 8
With range: -&gt;8
</code></pre>

blocks|key|1791135|text|如果您的grep没有-A、-B和-C，那么这个sed命令可能适用于您：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1791136|sed+-n+'1bb;:a;/PATTERN/{h;n;p;H;g;bb};N;//p;:b;99,$D;ba'+inputfile+>+outputfile|code-block|syntax|javascript|1791137|其中，PATTERN是您所寻找的正则表达式，而99是大于所需的上下文行数(等效于-C+98)的正则表达式。|1791138|它的工作方式是在内存中保留一个行窗口，当regex匹配时，将输出捕获的行。|1791139|如果您的sed不喜欢分号，并且更喜欢-e，那么这个版本可能适用于您：|1791140|sed+-n+-e+'1bb'+-e+':a'+-e+'/PATTERN/{h'+-e+'n'+-e+'p'+-e+'H'+-e+'g'+-e+'bb}'+-e+'N'+-e+'//p'+-e+':b'+-e+'99,$D'+-e+'ba'+inputfile+>+outputfile|1791141|对于您的行范围输出，如果在范围结束后有大量行，这将工作得更快一些：|1791142|sed+-n+'100000,20000p;q'+inputfile+>+outputfile|1791143|或|1791144|sed+-n+-e+'100000,20000p'+-e+'q'+inputfile+>+outputfile|1791145|entityMap^0|4|4|A|2|D|2|G|2|N|3|0|0|3|7|N|2|14|5|0|0|4|3|I|2|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|12|8|@$9|13|A|14|B|C]|$9|15|A|16|B|C]|$9|17|A|18|B|C]|$9|19|A|1A|B|C]|$9|1B|A|1C|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|1D|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|1E|8|@$9|1F|A|1G|B|C]|$9|1H|A|1I|B|C]|$9|1J|A|1K|B|C]]|D|@]|E|$]]|$1|M|3|N|5|6|7|1L|8|@]|D|@]|E|$]]|$1|O|3|P|5|6|7|1M|8|@$9|1N|A|1O|B|C]|$9|1P|A|1Q|B|C]]|D|@]|E|$]]|$1|Q|3|R|5|H|7|1R|8|@]|D|@]|E|$I|J]]|$1|S|3|T|5|6|7|1S|8|@]|D|@]|E|$]]|$1|U|3|V|5|H|7|1T|8|@]|D|@]|E|$I|J]]|$1|W|3|X|5|6|7|1U|8|@]|D|@]|E|$]]|$1|Y|3|Z|5|H|7|1V|8|@]|D|@]|E|$I|J]]|$1|10|3|-4|5|6|7|1W|8|@]|D|@]|E|$]]]|11|$]]

If your <code>grep</code> doesn't have <code>-A</code>, <code>-B</code> and <code>-C</code>, then this <code>sed</code> command may work for you:

<pre><code>sed -n '1bb;:a;/PATTERN/{h;n;p;H;g;bb};N;//p;:b;99,$D;ba' inputfile &gt; outputfile
</code></pre>

where <code>PATTERN</code> is the regular expression your looking for and <code>99</code> is one greater than the number of context lines you want (equivalent to <code>-C 98</code>).

It works by keeping a window of lines in memory and when the regex matches, the captured lines are output. 

If your <code>sed</code> doesn't like semicolons and prefers <code>-e</code>, this version may work for you:

<pre><code>sed -n -e '1bb' -e ':a' -e '/PATTERN/{h' -e 'n' -e 'p' -e 'H' -e 'g' -e 'bb}' -e 'N' -e '//p' -e ':b' -e '99,$D' -e 'ba' inputfile &gt; outputfile
</code></pre>

For your line range output, this will work and will finish a little more quickly if there are a large number of lines after the end of the range:

<pre><code>sed -n '100000,20000p;q' inputfile &gt; outputfile
</code></pre>

or

<pre><code>sed -n -e '100000,20000p' -e 'q' inputfile &gt; outputfile
</code></pre>

I have two queries

<ol>
<li>I do a grep and get the line number of the input file. i want to retrieve a set of lines before and after the line number from the inputfile and redirect to a /tmp/testout file. how can i do it.</li>
<li>I have a line numbers 10000,20000. I want to retrieve the lines between 10000 and 20000 of the input file and redirect to a /tmp/testout file. how can i doi it</li>
</ol>

Regarding grep command

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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我有两个问题我做了一个grep并得到输入文件的行号。我想从inputfile中检索行号前后的一组行，然后重定向到/tmp/testout文件。我该怎么做呢。我的电话号码是10000,20000。我想检索输入文件的10000到20000之间的行，然后重定向到/tmp/testout文件。我该怎么做？

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