Linux commands: Masking code umask

umask Introduction to Commands

Umask command to display and set default permissions for files and directories

1 . Command format:

Umask mode modify default permissions for Umask

2 . Command function:

Set the default permissions for files and directories

3 . Command parameters:

Usmask mode

The file cannot have execute permissions by default, and if there are execute permissions in the result,

Add 1 to its permissions

Default permissions for new files =666-umask

Default permissions for the new directory =777-umask

4 . Command instance:

1, umask 022 set umask default value is 022

[Email protected] ~]# umask 022

[[email protected] ~]# umask Direct Input umask command, view umask current value

0022

[Email protected] test]# Ls-al

-rw-r--r--. 1 root root 0 October 11:42 A file a permission of 644=666-umask=666-022=644

Drwxr-xr-x. 2 root root 4096 October 11:42 a.directory directory a permission is 755=777-022

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Linux commands: Masking code umask