|isutf8 [-hq] [--help] [--quiet] [[file...]]|
isutf8 checks whether files are syntactically valid UTF-8. Input is either files named on the command line, or the standard input. Notices about files with invalid UTF-8 are printed to standard output.
-h, --helpPrint out a help summary.
-q, --quietDont print messages telling which files are invalid UTF-8, merely indicate it with the exit status.
If the file is valid UTF-8, the exit status is zero. If the file is not valid UTF-8, or there is some error, the exit status is non-zero.