cron.d는 시스템에 어떻게 통지합니까?

새 스크립트를 /etc/cron.d/시스템에 삽입하면 시스템이 전역 crontab에 스크립트를 삽입 하는 방법 을 어떻게 알 수 있습니까?

프로세스를 다시 시작해야합니까?

않는 init분마다 crontab을 실행하고, 그 다음에 재 - 스캔 한거야?

inotify와 watch를 사용합니까 /etc/cron.d?

굉장히 명백한 것을 찾을 수 없었으며 항상 궁금했습니다.

cron (8)에서 :

   Additionally,  cron  reads  the files in /etc/cron.d: it treats the files in
   /etc/cron.d as in the same way as the /etc/crontab file

   …

   cron then wakes up every minute, examining all stored crontabs, checking each com‐
   mand to see if it should be run in the current minute.  When  executing  commands,
   any  output  is  mailed  to  the owner of the crontab (or to the user named in the
   MAILTO environment variable in the crontab, if such exists).  The children  copies
   of  cron  running these processes have their name coerced to uppercase, as will be
   seen in the syslog and ps output.

   Additionally, cron checks each minute to see if its spool directory's modtime  (or
   the  modtime  on  /etc/crontab) has changed, and if it has, cron will then examine
   the modtime on all crontabs and reload those which have changed.  Thus  cron  need
   not  be  restarted  whenever a crontab file is modified.  Note that the crontab(1)
   command updates the modtime of the spool directory whenever it changes a crontab.

또한 cron은 "전역 crontab에 cron.d의 내용을 삽입하지 않습니다"는 점에 유의하십시오.

   However, they are independent of /etc/crontab: they do not, for example, inherit 
   environment  variable  settings  from it.