如何使用新的/中断行对文件中的文本进行grep

Question

我必须用下面的内容解析多个文件的内容：

style=3D""><a href=3D"https://123456789.com/accounts/confirm_email/19AbCDx=
K/bWFyY29A1234529zYW50dWNjaS5ldQ/?app_redirect=3DFalse&amp;ndid=3DHMTU1Mjk=
wODY5OTA1MDk2NTptYXJjb0BtYXJjb3NhbnR1Y2NpLmV1Ojg1OQ" style=3D"color:#3b599

我必须提取https链接，但我的grep命令不能忽略新行return，并以中继结果结束：

命令

grep -r -m1 -oh "https://123456789.com/accounts/confirm_email*\s*[^ ]*" /folder/

结果

https://123456789.com/accounts/confirm_email/19AbCDx=

DESIDERED结果

https://123456789.com/accounts/confirm_email/19AbCDx=K/bWFyY29A1234529zYW50dWNjaS5ldQ/?app_redirect=3DFalse&ndid=3DHMTU1MjkwODY5OTA1MDk2NTptYXJjb0BtYXJjb3NhbnR1Y2NpLmV1Ojg1OQ

PS：'=‘字符不是(总是)链接的一部分，但在换行时它是文件的格式。

注意：https://123456789.com/accounts/confirm_email/是链接在所有文件中重复的唯一常量。

如果我添加-z选项，-m1选项被忽略，结果是：

https://123456789.com/accounts/confirm_email/19AbCDx=
K/bWFyY29A1234529zYW50dWNjaS5ldQ/?app_redirect=3DFalse&ndid=3DHMTU1Mjk=
wODY5OTA1MDk2NTptYXJjb0BtYXJjb3NhbnR1Y2NpLmV1Ojg1OQ"https://123456789.com/accounts/confirm_email/19AbCDx=
K/bWFyY29A1234529zYW50dWNjaS5ldQ/?app_redirect=3DFalse&ndid=3DHMTU1Mjk=
wODY5OTA1MDk2NTptYXJjb0BtYXJjb3NhbnR1Y2NpLmV1Ojg1OQ"https://123456789.com/accounts/confirm_email/19AbCDx=
K/bWFyY29A1234529zYW50dWNjaS5ldQ/?app_redirect=3DFalse&ndid=3DHMTU1Mjk=
wODY5OTA1MDk2NTptYXJjb0BtYXJjb3NhbnR1Y2NpLmV1Ojg1OQ"

如果我在命令后面添加|head -3，但最后一行重复了http

命令

grep -r -oh -z "https://123456789.com/accounts/confirm_email*\s*[^ ]*" /folder/ |head-3

https://123456789.com/accounts/confirm_email/19AbCDx=
K/bWFyY29A1234529zYW50dWNjaS5ldQ/?app_redirect=3DFalse&ndid=3DHMTU1Mjk=
wODY5OTA1MDk2NTptYXJjb0BtYXJjb3NhbnR1Y2NpLmV1Ojg1OQ"https://123456789.com/accounts/confirm_email/19AbCDx=

我怎么能排除它呢？

Answer 1

man grep

-z, --null-data
       Treat  the  input  as  a set of lines, each terminated by a zero
       byte (the ASCII NUL character) instead of a newline. - -

所以：

$ grep -z -r -m1 -oh "https://123456789.com/accounts/confirm_email*\s*[^ ]*" file

输出：

https://123456789.com/accounts/confirm_email/19AbCDx=
K/bWFyY29A1234529zYW50dWNjaS5ldQ/?app_redirect=3DFalse&ndid=3DHMTU1Mjk=
wODY5OTA1MDk2NTptYXJjb0BtYXJjb3NhbnR1Y2NpLmV1Ojg1OQ"

换行符仍然存在，但您可以使用tr -d \\n删除它们