Many users regularly encounter the read-only attribute, which will prevent most software from allowing the user to overwrite or append to a file. Software can be designed to override this option, often after receiving confirmation from the user. The archive attribute is used by various backup and file copy programs as a hint as to whether a file needs to be backed up. The hidden attribute makes affected files invisible in many programs, although a variety of software, especially software designed for listing, viewing, and searching files, allows hidden files to be made visible, often with a notation that they have been designated as hidden. The system attribute is used to designate certain operating system files and affects the operation of most software less than the other attributes.
attrib, *.txt), all attributes will be removed from the targeted files (in this case, all .txt files in the folder). In most versions, if a target isn't specified, then all attributes will be removed from the folder currently being browsed in DOS.
caclsMS-Windows NT filesystem ACL control utility