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perl -pie 's/old/new/g' ./*/*

perl -pie 's/old/new/g' subdir/file1 subdir/file2 subdir2/file1 subdir
+2/subsubdir/

perl -pi -e 's/old/new/g' file1 dir1/file2 /usr/local/file3 /tmp/*

perl -pie 's/old/new/g' ./*
...
perl -pie 's/old/new/g' ./*/*/*/*
perl -pie 's/old/new/g' ./*/*/*/*/*
etc.....