:) Had not spotted the humour section on gnu.org before. From the same site, the source code of ed: while :;do read x;echo \?;done -- https://www.gnu.org/fun

:) Had not spotted the humour section on gnu.org before. From the same site, the source code of ed: while :;do read x;echo \?;done -- https://www.gnu.org/fun/jokes/ed.html https://www.gnu.org/fun/jokes/ed.html