setgid bit in umask of systemd service script

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I have a downloader service running, and I'd like it to set the setgid bit of every directory it creates. Its already doing so, but I suspect that's because at the moment, the parent directory also has setgid. What do I set the umask to?



I'm also wondering how umask, particularly in a systemd script, works for the "4th" digit. I understand that its inverted, so that umask = 002 is like chmod 775. But what about umask = 2002. Is that chmod 5775? or chmod 2775?



Thanks!




linux ubuntu files filesystems




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  • It should be 2775!
    – George Udosen
    Jan 22 at 1:33














up vote
1
down vote

favorite












I have a downloader service running, and I'd like it to set the setgid bit of every directory it creates. Its already doing so, but I suspect that's because at the moment, the parent directory also has setgid. What do I set the umask to?



I'm also wondering how umask, particularly in a systemd script, works for the "4th" digit. I understand that its inverted, so that umask = 002 is like chmod 775. But what about umask = 2002. Is that chmod 5775? or chmod 2775?



Thanks!




linux ubuntu files filesystems




share|improve this question




















  • It should be 2775!
    – George Udosen
    Jan 22 at 1:33












up vote
1
down vote

favorite









up vote
1
down vote

favorite











I have a downloader service running, and I'd like it to set the setgid bit of every directory it creates. Its already doing so, but I suspect that's because at the moment, the parent directory also has setgid. What do I set the umask to?



I'm also wondering how umask, particularly in a systemd script, works for the "4th" digit. I understand that its inverted, so that umask = 002 is like chmod 775. But what about umask = 2002. Is that chmod 5775? or chmod 2775?



Thanks!




linux ubuntu files filesystems




share|improve this question












I have a downloader service running, and I'd like it to set the setgid bit of every directory it creates. Its already doing so, but I suspect that's because at the moment, the parent directory also has setgid. What do I set the umask to?



I'm also wondering how umask, particularly in a systemd script, works for the "4th" digit. I understand that its inverted, so that umask = 002 is like chmod 775. But what about umask = 2002. Is that chmod 5775? or chmod 2775?



Thanks!





linux ubuntu files filesystems





share|improve this question











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asked Jan 21 at 21:25









Kayson

82




82











  • It should be 2775!
    – George Udosen
    Jan 22 at 1:33
















  • It should be 2775!
    – George Udosen
    Jan 22 at 1:33















It should be 2775!
– George Udosen
Jan 22 at 1:33




It should be 2775!
– George Udosen
Jan 22 at 1:33










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I believe the octal numbers for:



  • sticky bit is 1,

  • setgid on directories: 2, and

  • setuid on files: 4.

So for the case your asking it would be: umask 2002 ==> 2775 for folders.






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    1 Answer
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    active

    oldest

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    1 Answer
    1






    active

    oldest

    votes









    active

    oldest

    votes






    active

    oldest

    votes








    up vote
    0
    down vote



    accepted










    I believe the octal numbers for:



    • sticky bit is 1,

    • setgid on directories: 2, and

    • setuid on files: 4.

    So for the case your asking it would be: umask 2002 ==> 2775 for folders.






    share|improve this answer
























      up vote
      0
      down vote



      accepted










      I believe the octal numbers for:



      • sticky bit is 1,

      • setgid on directories: 2, and

      • setuid on files: 4.

      So for the case your asking it would be: umask 2002 ==> 2775 for folders.






      share|improve this answer






















        up vote
        0
        down vote



        accepted







        up vote
        0
        down vote



        accepted






        I believe the octal numbers for:



        • sticky bit is 1,

        • setgid on directories: 2, and

        • setuid on files: 4.

        So for the case your asking it would be: umask 2002 ==> 2775 for folders.






        share|improve this answer












        I believe the octal numbers for:



        • sticky bit is 1,

        • setgid on directories: 2, and

        • setuid on files: 4.

        So for the case your asking it would be: umask 2002 ==> 2775 for folders.







        share|improve this answer












        share|improve this answer



        share|improve this answer










        answered Jan 22 at 1:38









        George Udosen

        1,112318




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