tldr/pages/common/umask.md

umask

Manage the read/write/execute permissions that are masked out (i.e. restricted) for newly created files by the user.

• Display the current mask in octal notation:

umask

• Display the current mask in symbolic (human-readable) mode:

umask -S

• Change the mask symbolically to allow read permission for all users (the rest of the mask bits are unchanged):

umask {{a+r}}

• Set the mask (using octal) to restrict no permissions for the file's owner, and restrict all permissions for everyone else:

umask {{077}}