Use Grep to Find Content and Move

From Stack Overflow

If you want to find and move files that do not match your pattern (move files that don’t contain 'Subject \[SPAM\]' in this example) use:

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grep -L -Z -r 'Subject: \[SPAM\]' . | xargs -0 -I{} mv {} DIR

The -Z means output with zeros (\0) after the filenames (so spaces are not used as delimeters).

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xargs -0

means interpret \0 to be delimiters.

The -L means find files that do not match the pattern. Replace -L with -l if you want to move files that match your pattern.

Then

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-I{} mv {} DIR

means replace {} with the filenames, so you get mv filenames DIR.