Searching on Linux – ‘grep’ command

So I’m investigating an Eclipse error I’m getting on my dev laptop and need to search for a bit of text in a file that may be in a hidden file somewhere in my workspace. I don’t trust Eclipse’s global File search (Ctrl + H) to be thorough enough for my needs. I need to do this via the OS.
The “Grep” command is the solution.

It is used like so:

sudo grep ""

For example:

sudo grep "IOException" *.log

Now, my particular issue meant that I didn’t know which folder the file would be located in. To get around that, I used the recursive argument or ‘-r’:

sudo grep -r "IOException" *.log

This loops through all the files in the current directory, as well as sub-directories of the current directory.
At least that’s how I understand it to work. Feel free to correct me if that’s not the case.

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