如何使用 sed 删除文件中的多行

Question

The test.txt file contains 3 lines:

STREET=main
PHONE=123
EMAIL=abc@xyz.com

To remove two lines with the STREET and EMAIL I run the sed twice in a row:

sed -i -- 's/STREET=.*//' test.txt
sed -i -- 's/EMAIL=.*//' test.txt

Instead of using the sed command twice I would rather remove both lines with a single sed command. How to do it?

Answer 1

To delete ( d ) lines which contain STREET= or EMAIL= .

sed -i -- '/STREET=/d; /EMAIL=/d' file

Answer 2

sed -i -- 's/STREET=.*//;s/EMAIL=.*//' test.txt

Answer 3

The following sed one-liners show how to remove/empty the target lines:

Empty the target lines:

kent$  sed 's/^\(EMAIL\|STREET\)=.*//' file

PHONE=123

Remove the target lines:

kent$  sed '/^\(EMAIL\|STREET\)=/d' file
PHONE=123

Using pattern ^\(EMAIL\|STREET\)= will avoid to touch lines like USER_EMAIL=... or SOME_STREET=