How would you edit `/etc/crontab` and files under `/etc/cron.d/?

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In my /etc/crontab



# /etc/crontab: system-wide crontab
# Unlike any other crontab you don't have to run the `crontab'
# command to install the new version when you edit this file
# and files in /etc/cron.d. These files also have username fields,
# that none of the other crontabs do.


We can use crontab to edit a user-defined crontab files under /var/spool/cron/crontabs/, but can't use the same way to edit /etc/crontab or files under /etc/cron.d/. Are they supposed to be edited? If yes, how? Thanks.






cron







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    -1
    down vote

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    In my /etc/crontab



    # /etc/crontab: system-wide crontab
    # Unlike any other crontab you don't have to run the `crontab'
    # command to install the new version when you edit this file
    # and files in /etc/cron.d. These files also have username fields,
    # that none of the other crontabs do.


    We can use crontab to edit a user-defined crontab files under /var/spool/cron/crontabs/, but can't use the same way to edit /etc/crontab or files under /etc/cron.d/. Are they supposed to be edited? If yes, how? Thanks.






    cron







    share|improve this question























      up vote
      -1
      down vote

      favorite









      up vote
      -1
      down vote

      favorite











      In my /etc/crontab



      # /etc/crontab: system-wide crontab
      # Unlike any other crontab you don't have to run the `crontab'
      # command to install the new version when you edit this file
      # and files in /etc/cron.d. These files also have username fields,
      # that none of the other crontabs do.


      We can use crontab to edit a user-defined crontab files under /var/spool/cron/crontabs/, but can't use the same way to edit /etc/crontab or files under /etc/cron.d/. Are they supposed to be edited? If yes, how? Thanks.






      cron







      share|improve this question













      In my /etc/crontab



      # /etc/crontab: system-wide crontab
      # Unlike any other crontab you don't have to run the `crontab'
      # command to install the new version when you edit this file
      # and files in /etc/cron.d. These files also have username fields,
      # that none of the other crontabs do.


      We can use crontab to edit a user-defined crontab files under /var/spool/cron/crontabs/, but can't use the same way to edit /etc/crontab or files under /etc/cron.d/. Are they supposed to be edited? If yes, how? Thanks.






      cron




      cron






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      Tim

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