Hi All,
I wanna add some text to a file in its fixed position.Say the line 3. How to achieve?
That is , if the file(a.txt) like:
ab
cd
ef
ghij
klmn
I wanna add "a test content\n" after the "ef".My ideal result is :
ab
cd
ef
a test content
<blank line>
ghij
klmn
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