umask
When you create a file, it’s given the permission rw-r--r-- by default.
A directory is given the permission rwxr-xr-x.
These default values are determined by the value of umask.
Type umask to see what your umask value is. For example:
$ umask
022
저는 이렇게 보이네요.
byoungguk@linuxtip:~$ umask
0022
파일이 644 --> 위 수치와 합하면 666
디렉토리 755 --> 합하면 777
The umask value masks the permissions value of 666 for a file and 777 for a directory.
The umask value of 022 results in permission for a directory of 755 (rwxr-xr-x).
That same umask results in a file permission of 644 (rw-r--r--).
(Execute permissions are off by default for regular files.)
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