我有一堆行findmydomain.txt，只想提取那些在域后没有路径的域名并将它们保存在新文件中。
我不知道如何做到这一点，因为有些域名以 结尾.gov，有些以 结尾.vn，有些则没有www等等。
我期望仅提取域名，而无需将文件路径提取到新文件。例如：
http://www.drexel.edu/
http://trianglewordpress.com/
http://www.nasa.gov/
http://www.mexico.com.mx/
查找我的域.txt
http://www.safmls.org/2009/2009%20Presentations/Hemostasis%20-%20Stop%20Doing%20Bleeding%20Times.doc
http://debsabo.com/Luke_2.doc
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http://www.uky.edu/~clthyn2/PS671/Concepts_and_Theory_in_Political_Science.docx
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http://psych.stanford.edu/~jlm/Presentations/SymSys100_04-07-09-AreHumansRational.doc
http://www.ksums.net/files/1st/Archive/01.Foundation%20Block/Male/Pathology/Neoplasia%20Lecture%201%20&%202.docx
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http://eshare.stust.edu.tw/EshareFile/2013_5/2013_5_b4c4905a.docx
http://sbs.wsu.edu/biol352/ControlofGeneExpression.doc
http://www.ohio.edu/plantbio/staff/showalte/PBIO%20450%20&%20550/Emch.docx
http://www.mcet.org/mining/environment/Toolkit/Training%20Presentations/Developing%20SWPPP%20Presentation/Dev_SWPPP%20Presentation.doc
http://www.uic.edu/classes/phyb/phyb402dbh/Hypothalamus%20and%20Pituitary.doc
http://www.cancer.org/acs/groups/content/@research/documents/document/acspc-041647.docx
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http://ieee-icsc.org/icsc2013/ICSC2013_Luciano_Tutorial.docx
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http://static.schoolrack.com/files/13968/580817/Light_-_electromagnetic_Spectrum%2C_reflection%2C_refraction_2013.docx
http://www1.eere.energy.gov/hydrogenandfuelcells/docs/doe_presentation.doc
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http://research.che.tamu.edu/groups/Seminario/CHEN320_Fall_2013_files/num-g05-massflow.docx
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http://www.ise.ncsu.edu/wysk/courses/ISE316/ISE316-Course-presentation/Chapter%2020.docx
http://www.belgianbraincouncil.be/files/2010.09.16_EXPECTATIONS_AND_RIGHTS_OF_PATIENTS_SUFFERING_FROM_A_BRAIN_DISORDER.doc
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http://classes.mst.edu/edtech/TLT2012/presentations/TLT-2012-mhays-BbCollaborate-01.docx
http://asja-eg.com/admin/cmes/files/Pediatric%20equipmentfinal.docx
http://www.outreach.mcb.harvard.edu/teachers/Summer05/ElizabethMick/TheNervousSystem.doc
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答案1
一种简单的方法是只搜索以http://或开头的所有行，并且末尾https://没有其他行或只有一个行。与扩展正则表达式一起/使用。grep例如：
$ grep -E 'http.?://[^/]+/?$' file
http://www.drexel.edu/
http://trianglewordpress.com/
http://www.nasa.gov/
http://www.alexa.com/
http://chotenmien.vn/
http://www.mexico.com.mx/
答案2
这将得到您在示例中显示的结果。
grep '^[^/]*/[^/]*/[^/]*/$' findmydomain.txt >new
这些并不是真正的“域名”，它们是可能带有一个或多个子域的 URL。例如，在 中www.google.com，域名为google.com和www只是一个单独的节点名称。在一般情况下，从主机名解析 TLD 是一个更加复杂的问题，需要了解每个单独的 TLD。
严格来说，最后的斜杠是可选的； @terdon 的答案使用更复杂的正则表达式来解决这个问题。作为一个快速而肮脏的修复，您可以*在此处的最后一个斜杠后面添加一个（但是，它也可以http://example.com///与任意数量的冗余尾部斜杠匹配）。正则表达式查找其中恰好包含三个斜杠的行，并且在它们之前和之间具有可选的非斜杠字符。
答案3
一次性sed解决方案：
sed -n '\_[^:/]/._!{p;d};w out.txt' findmydomain.txt
没有路径的 URL（如http://xxx.com/或https://yyy.org，带或不带尾部斜杠）被写入文件out.txt，而其他的则被打印并可以重定向到另一个文件（或者您可以使用-i就地编辑选项，如果您的sed支持的话）。
该模式[^:/].匹配任何不跟在另一个斜杠或冒号后面的斜杠的出现（因此它不是来自http://）并且位于另一个字符之前。
我确实使用了\_..._而不是/.../选择了行，所以我不需要转义模式中的斜线（感谢@tripleee提醒我解释这一点！）。
答案4
怎么样awk办法吗？
cat domain.txt |awk -F"/" '{print $1 $2"//" $3"/"}'：
http://www.drexel.edu/
http://trianglewordpress.com/
http://www.nasa.gov/
http://www.mexico.com.mx/
domain.txt 是输入文件。