поиск файлов в иерархии каталогов (search for files in a directory hierarchy)
Статус выхода (Exit)
find exits with status 0 if all files are processed successfully,
greater than 0 if errors occur. This is deliberately a very
broad description, but if the return value is non-zero, you
should not rely on the correctness of the results of find.
When some error occurs, find may stop immediately, without
completing all the actions specified. For example, some starting
points may not have been examined or some pending program
invocations for -exec ... {} + or -execdir ... {} + may not have
been performed.
