Awk 仅使用命令行解析url
我有一个如下所示的csv文件：Awk 仅使用命令行解析url,awk,sed,Awk,Sed,我有一个如下所示的csv文件： id,author,url 1,bob,http://mywebsite.com/path/to/content 2,john,https://anotherwebsite.com/path/to/some/other/content 3,alice,http://www.somewebsite.com/path/to/content 我想把它变成： id,author,url 1,bob,mywebsite.com 2,john,anotherwebsite.
id,author,url
1,bob,http://mywebsite.com/path/to/content
2,john,https://anotherwebsite.com/path/to/some/other/content
3,alice,http://www.somewebsite.com/path/to/content
id,author,url
1,bob,mywebsite.com
2,john,anotherwebsite.com
3,alice,somewebsite.com
awksedawk -F, 'NR>1{split($3,a,"/");$0=$1","$2","a[3]}1' file
id,author,url
1,bob,mywebsite.com
2,john,anotherwebsite.com
3,alice,www.somewebsite.com
，然后，对于除第一行
NR>1$31同时删除
www.awk -F, 'NR>1{split($3,a,"/");sub(/^www./,"",a[3]);$0=$1","$2","a[3]}1'
id,author,url
1,bob,mywebsite.com
2,john,anotherwebsite.com
3,alice,somewebsite.com
在SO中有很多类似的问题，它们要求使用re解析url。真诚的回答是，请不要。如果你想学习这两种工具，你需要找到更合适的。url不适合re。您希望
www.somewebsite.comsomewebsite.comwwwfoo.somewebsite.comwww.google.comdrive.google.comcalendar.google.com子（/^www./，”，a[3]）www.www.awk-F'[，/]+''NR>1{match（$4，/[^.]+\..[^.]+$/）；$0=$1“，“$2”，“substr（$4，RSTART，RLENGTH）}1”文件site.com.brcom.brdrive.google.comgoogle.comwww.google.comwww.time.co.uktime.co.uktime.co.uktime.co.uktime.co.ukco.uk