Linux command--umask

1. Command format:

   umask nnn (nnn on behalf of number 000-777)

2. Command function:

   umask permissions complement, the role is to set the default directory or file permissions with. The default value is 022, at which point the default permissions for the directory you are building are 755 (7-0,7-2,7-2), and the file default permissions established are 644 (6-0,6-2,6-2)

3. Common examples:

Example 1:umask # #查询当前umask权限数值

Example 2:umask 002 # #修改umask权限数值为002, modified to create directories and files with default permissions of 775 and 664

To modify the value of the umask for a long time, you can write it into/etc/profile or ~/.profile or ~/.bash_profile

Linux command--umask