inserting a line before a certain text in multiple files in a folder

[coolheadash]

Hi all,

I have a folder named "folder" having multiple files inside different nested folders.
Many files under it have a certain text that i am looking for. Before this line, I have to add a line and save it.

The certain text is something like:
return xyz;
}

If its this I want to add a line just before return xyz;
printf("xyz");

if the certain text (return xyz) is present but no ( } ), then I want to add
{
printf("xyz");
certain text(return xyz;)
}

.... The file in which i find such text, i to add a nth line.

thanks.

[nithinpes]

Let us know what you have tried so far.
To parse through hierarchial directory structure (multiple sub-folders), you can make use of File::Find module.