Text editor: qed

qed stands for quick editor and is a line oriented text editor which as developed between 1965 and 1966.

Ken Thompson later reimplemented qed and added regular expressions.

Because Ken Thompson was one of the primary developers of Unix, qed has a great influence on later developments of text editors or regular expression «environments» in the Unix univers, for example

• ed
• sed, the Stream editor which implemented some qed-scripting features that were not reimplemented in ed.
• ex
• grep (non interactive)
• sam
• awk
• vi
• Perl