Sed command replace the first occurrence in file

Question

I am trying find and replace the line one of the existing file, when I am running the below sed command it is replacing all the lines which have the matched string, but instead I want to change only one place inside the file.

sed -i 's/azure.com/test.com/' file_name

Actual file

server_name azure.com
server_name azure.com

Expected result

server_name test.com
server_name azure.com

Does this answer your question? [How to use sed to replace only the first occurrence in a file?](https://stackoverflow.com/questions/148451/how-to-use-sed-to-replace-only-the-first-occurrence-in-a-file) — Dabombber, Aug 18 '20 at 06:12

score 1 · Answer 1 · answered Aug 18 '20 at 06:14

You can do this with portable sed with a simple loop.

sed '/azure\.com/{
    s//test.com/
    :a
    n
    ba
}' file

When you see a match, substitute; then start a loop which simply consumes and prints the rest of the file.

This is significantly less obscure in Awk. If you have GNU Awk, you even have an -i inplace option which behaves like sed's -i option.

awk '/azure\.com/ && !p { sub(/azure.com/, "test.com"); p=1 }' file

score 0 · Answer 2 · edited Aug 18 '20 at 06:08

0

Try this:

sed -i "0,/ azure.com: /{s/ azure.com/ test.com/}" file_name

It will replace only the first occurrence of azure.com from the file.

edited Aug 18 '20 at 06:08

tripleee

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answered Aug 18 '20 at 05:22

Sakshi Rathore

1

remove the extra / : – Sakshi Rathore Aug 18 '20 at 05:23
No its not working – Anonymuss Aug 18 '20 at 05:30
The `0` pattern is a GNU `sed` extension. – tripleee Aug 18 '20 at 06:07
sed -i "0,/azure.com/test.com/g" file_name – Sakshi Rathore Aug 18 '20 at 07:03

Sed command replace the first occurrence in file

2 Answers2