How to append a line after a search result?
So I grep for something in some file:
grep "import" test.txt | tail -1
In test.txt there is
import-one
import-two
import-three
some other stuff in the file
This will return the last search result:
import-three
Now how do I add some text -after-- import-three but before "some other stuff in the file". Basically I want to append a line but not at the end of a file but after a search result.
I understand that you want some text after each search result, which would mean after every matching line. So try
grep "import" test.txt | sed '/$/ aLine to be added'
You can try something like this with sed
sed '/import-three/ a
> Line to be added' t
Test:
$ sed '/import-three/ a
> Line to be added' t
import-one
import-two
import-three
Line to be added
some other stuff in the file
One way assuming that you cannot distingish between different "import" sentences. It reverses the file with tac , then find the first match (import-three) with sed , insert a line just before it ( i ) and reverse again the file.
The :a ; n ; ba :a ; n ; ba :a ; n ; ba is a loop to avoid processing again the /import/ match.
The command is written throught several lines because the sed insert command is very special with the syntax:
$ tac infile | sed '/import/ { i
"some text"
:a
n
ba }
' | tac -
It yields:
import-one
import-two
import-three
"some text"
some other stuff in the file
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