explainshell.com - exiftool %24f %7C grep -i %27last modified by%27 %7C grep -iv %27santa%27

Read and write meta information in files

-i DIR (-ignore)
     Ignore specified directory name.  Use multiple -i options to ignore more than one directory name.  A
     special DIR value of "SYMLINKS" (case sensitive) may be specified to ignore symbolic links when the
     -r option is used.