Lobo mail umask

A classic Unix question!

umask is a shell command that sets the file creation mask, which determines the default permissions for newly created files and directories.

lobo is not a standard Unix command, so I'm assuming you meant to ask about umask itself.

Here's a brief overview:

What is umask?

umask is a shell command that sets the file creation mask, which is a three-digit octal number that specifies the permissions that will be subtracted from the default permissions of a newly created file or directory.

How does umask work?

When you create a new file or directory, the operating system uses the default permissions for that type of file or directory. The umask value is subtracted from these default permissions to determine the actual permissions of the newly created file or directory.

For example, if the default permissions for a file are rw-r--r-- (644) and the umask is 002, the actual permissions of the file will be r--r--r-- (604).

How to use umask

To set the umask value, use the following command:

umask [octal_value]

For example, to set the umask to 002 (which allows read and execute permissions for the owner, and read permissions for the group and others), use:

umask 002

To set the umask to 022 (which allows read and execute permissions for the owner, and read permissions for the group, but not for others), use:

umask 022

Note: The umask value is usually set in the shell configuration file (~/.bashrc or ~/.profile) or in the system-wide configuration file (/etc/bashrc or /etc/profile).