инструмент сертификата GnuTLS (GnuTLS certificate tool)
Статус выхода (Exit)
One of the following exit values will be returned:
0 (EXIT_SUCCESS)
Successful program execution.
1 (EXIT_FAILURE)
The operation failed or the command syntax was not valid.
70 (EX_SOFTWARE)
libopts had an internal operational error. Please report
it to autogen-users@lists.sourceforge.net. Thank you.