Usage: /usr/bin/isutf8 [OPTION]... [FILE]...
Check whether input files are valid UTF-8.

  -h, --help       display this help text and exit
  -q, --quiet      suppress all normal output
  -l, --list       print only names of FILEs containing invalid UTF-8
  -i, --invert     list valid UTF-8 files instead of invalid ones
  -v, --verbose    print detailed error (multiple lines)

This is version 1.2.