Linux umask settings

Security mechanism of the system: Umask (Filter code)

Use the Umask command to view the values of the current user

For ordinary users umask:0002

For administrators umask:0022

So when

When the administrator creates the folder, it is 777-umask = 755

For administrators when creating files 666-umask = 644

So:

Administrator set up files by default is 644 permissions

Administrator-created folder default is 755 permissions

User-created file default is 664 permissions

User-created folder default is 775 permissions

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Umask can be changed.

Umask N:

For example: Umask 027

Suppose we let the user set 754 permissions: 777-754 = 023 So, umask =023

When creating a file, 666-023 = 643. However, the default permissions for a file do not have X permissions, so 643 automatically turns it into 642

The Umask setting is not persistent. Fails after re-landing

The command set with the Umask command is valid only for the current user's time shell.

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If you want him to work forever: you need to define Umask in the startup configuration file

Global:/etc/profile,/etc/profile.d/*/etc/bashre

Users: ~/.bash_profile, ~/.BASHRC

Profile class, applied to the interactive login shell

BASHRC class, non-interactive login.

Interactive logon: Read order: (higher priority)

/etc/profile--/etc/profile.d/*--and ~/.bash_profile--~/.BASHRC--/ETC/BASHRC

Non-interactive shell: The shell run sequence when a scripting system can be powered on and run automatically

~/.BASHRC--/ETC/BASHRC-/etc/profile.d/*

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So, if you want to change umask, edit/ETC/BASHRC.

If you want to modify the user individually, you only need to define the user's ~/.BASHRC

Linux umask settings