"Linux" Umask

1. The umask value is 022 by default

[Email protected] ~]# umask0022

2.umask function

Default File Permissions: 666 (Linux Create file default no Execute permission)-umask =644 (6-0,6-2,6-2)

[email protected] ~]# Touch 1[[email protected] ~]# ll-al 1-rw-r--r--. 1 root root 0 May 31 18:03 1

Default directory Permissions: 777-umask=755 (7-0,7-2,7-2)

[Email protected] ~]# mkdir test[[email protected] ~]# ll-dl test/drwxr-xr-x. 2 root root 4096 18:04 test/

3.umask Modification:

Once you know the role of umask, you can modify the value of Umask, for example: Umask 024 The default permissions for files and directories that are created later are 642,753.

"Linux" Umask