umask(2) - man - phpman

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}}