text - How to manipulate text with awk?

Question

How would I be able to manipulate the output text of grep.

Right now I am using the command:

grep -i "<url>" $file  >> ./txtFiles/$file.txt

This would output something like this:

<url>http://www.simplyrecipes.com/recipes/chicken_curry_salad/</url>

and then the next text will go to the next line.

How would I be able to get rid of the <url> and </url> and stop it from going to the next line at the end.

Answer 1

sed '/<\/*url>/!d;s///g'

• <\/*url>匹配开始和结束标签
• 删除没有这个的行
• 然后删除此模式的所有案例

以您的示例为例，它可能看起来像这样

sed '/<\/*url>/!d;s///g' $file >> ./txtFiles/$file.txt

Answer 2

单个命令：

sed -in '/<url>/ { s|<url>\(.*\)</url>|\1| ; p ; }' INPUT > OUTPUT

或者使用 awk：

awk -F "</?url>" '/<url>/ { print $2 }' INPUT > OUTPUT

注意<url>...</url>：如果单行上出现多个模式，两者都可能给您无效的输出。如果包含任何管道 ( ) 字符，sed则版本可能会失败。<url>...</url>|