关于umask的默认值

耐心学习

1. stu@master:~$ cat /etc/profile | grep umask
   
2. # The default umask is now handled by pam_umask.
   
3. # See pam_umask(8) and /etc/login.defs.
   
4. stu@master:~$ cat /etc/login.defs | grep umask
   
5. #       UMASK           Default "umask" value.
   
6. # UMASK is the default umask value for pam_umask and is used by
   
7. # Enable setting of the umask group bits to be the same as owner bits
   
8. stu@master:~$ cat /etc/login.defs | grep UMASK
   
9. #       UMASK           Default "umask" value.
   
10. # UMASK is the default umask value for pam_umask and is used by
    
11. # 022 is the "historical" value in Debian for UMASK
    
12. # If USERGROUPS_ENAB is set to "yes", that will modify this UMASK default value
    
13. UMASK           022
    
14. stu@master:~$ umask
    
15. 0002
    
16. stu@master:~$
    

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如上可见，我查系统的配置文件，umask默认值是022，但是我直接用umask命令，显示却是0002，为什么不一致？

1. stu@master:~$ lsb_release -a
   
2. No LSB modules are available.
   
3. Distributor ID: Ubuntu
   
4. Description:    Ubuntu 14.04.1 LTS
   
5. Release:        14.04
   
6. Codename:       trusty
   
7. stu@master:~$
   

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