Linux umask command
Linux umask command specified when creating the default file permission mask.
umask used to set the [permission mask]. [Permission mask] is composed of three octal number consisting, after subtracting the existing access permissions mask, you can generate when you create a file default permissions.
grammar
umask [-S][权限掩码]
Parameter Description:
-S In written form to indicate permission mask.
Examples
Using the command "umask" to view the current permission mask, enter the following command:
$ umask #获取当前权限掩码
After executing the above command, the output information is as follows:
0022
Next, use the command "mkdir" Create a directory and use the command "ls" for more information about the directory, enter the following command:
$ mkdir test1 #创建目录 $ ls –d –l test1/ #显示目录的详细信息
After executing the above command will display detailed information about the newly created directory, as follows:
drwxr-xr-x 2 rootlocal rootlocal 4096 2011-9-19 21:46 test1/
Note: The information in the above output, "drwxr-xr-x" = "777-022 = 755".