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Replace all sub-domains in a file with the another domain name using sed & wildcard

rated 0 times [ 4] [ 0] / answers: 1 / hits: 2250 / 2 Years ago, sun, september 25, 2022, 4:54:32

Replace all sub-domain names in a file with a different domain name using wildcard.

Ex : In a file, I have the following domains :

example1.domain1.com    

example2.domain1.com 

example3.domain1.com

I want to replace these sub-domain names with domain2.com. I tried using the below sed command. It works fine if the file size is small. But for large file it looks like the command execution never ends. I want to use a wildcard here since the text to be replaced have the same domain name i.e domain1.com.

sed -i s/.*.domain1.com/domain2.com/g test.txt

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pilun

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3 Years ago

answered 2 Years ago olfdit · Accepted Answer

If you use .*.domain1.com as your pattern, you will essiantially match unwanted characters, because . means any character.

You want to replace only "word characters" (ASCII letters, digits or underscore) using w+.

As normal sed regex doesn't know about +, make sure to add -r for sed to use extended regex.

Also make sure you use quotation marks! Otherwise * might be interpreted by bash.

And you should escape . in the pattern, otherwise it will also match any character.

sed -i.bak -r 's/w+.domain1.com/domain2.com/g' file