About: http://webisa.webdatacommons.org/156126538

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	Stdout is a file descriptor, and bash can use isatty() the same as any other program to determine if it is pointing to a tty or a file on disk. isatty() is provided by the OS, not bash.
http://www.w3.org/ns/prov#wasQuotedFrom	superuser.com