вычисление флагов ifa больше 0xFF из /proc/net/if _inet6

Я думаю, что ответ telcoM обнюхивает первопричину :Скорее всего, это связано с символической ссылкой, просто другой.

Основываясь на моих экспериментах, есть один набор обстоятельств, который отвечает всем требованиям:

• Test_folder— символическая ссылка на pdf2txt,и
• ОП использует стандартную macOS cp, унаследованную от BSD

Этот тип символической ссылки нарушает обнаружение циклов macOS cp. (GNU cp, который был бы установлен Homebrew или каким-либо другим менеджером пакетов, по умолчанию не использует символические ссылки, даже при рекурсивном копировании.)

Вот демонстрация, проверенная на macOS High Sierra:

$ ln -s pdf2txt Test_folder

$ ls -lAF Test_folder
lrwxr-xr-x 1 aho staff 7 Feb 13 20:13 Test_folder -> pdf2txt/

$ /bin/cp -r pdf2txt Test_folder
cp: Test_folder/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt: name too long (not copied)
cp: Test_folder/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt: name too long (not copied)

# Let's just look at the first 30 lines of a recursive ls
# (And yes, we're looking at pdf2txt)
$ ls -lRAF pdf2txt | head -n 30
pdf2txt:
total 0
drwxr-xr-x+ 5 aho staff 170 Feb 13 20:13 pdf2txt/
-rw-r--r--+ 1 aho staff   0 Feb 13 19:43 test1.txt
-rw-r--r--+ 1 aho staff   0 Feb 13 19:43 test2.txt

pdf2txt/pdf2txt:
total 0
drwxr-xr-x+ 3 aho staff 102 Feb 13 20:13 pdf2txt/
-rw-r--r--+ 1 aho staff   0 Feb 13 20:13 test1.txt
-rw-r--r--+ 1 aho staff   0 Feb 13 20:13 test2.txt

pdf2txt/pdf2txt/pdf2txt:
total 0
drwxr-xr-x+ 3 aho staff 102 Feb 13 20:13 pdf2txt/

pdf2txt/pdf2txt/pdf2txt/pdf2txt:
total 0
drwxr-xr-x+ 3 aho staff 102 Feb 13 20:13 pdf2txt/

pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt:
total 0
drwxr-xr-x+ 3 aho staff 102 Feb 13 20:13 pdf2txt/

pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt:
total 0
drwxr-xr-x+ 3 aho staff 102 Feb 13 20:13 pdf2txt/

pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt/pdf2txt:
total 0