umask:tldr:850d9
umask: Change the mask symbolically to allow read permission for all users (the rest of the mask bits are unchanged).
$ umask ${a+r}
try on your machine
The "umask" command is used to set the default permission for newly created files and directories.
In this specific command, "${a+r}" is a parameter that is being passed to the "umask" command.
The parameter "${a+r}" consists of two parts - "a" and "r".
- "a" refers to all three types of users: owner, group, and others.
- "+r" represents adding the "read" permission.
Together, the parameter "${a+r}" means adding the "read" permission for all users (owner, group, and others) when the default permissions for newly created files and directories are set.
This explanation was created by an AI. In most cases those are correct. But please always be careful and
never run a command you are not sure if it is safe.