Control-W for ‘delete word’ entered Unix in BSD 4.x, along with changing to ^U for line erase (Bell Labs used ^X), ^R for refresh (consensus has reverted to ^L), and ^T for status (which Linux annoyingly still doesn't have). These came from Tenex / TOPS-20, which also had a fancy command completion scheme whose vestiges can be seen in ftp(1) as well as Cicso gear.
Job control (with ^Z and ^Y) entered at the same time. At least Linux/SysV saw the usefulness of that....
Ah, excellent! Good to know that it is more ubiquitous than I suspected.
(The lack of ^T on Linux really annoys me too. What is worse is that it isn't just a matter of the line discipline sending SIGINFO for ^T... because Linux doesn't have SIGINFO at all. Means you can't even really hack up a pty wrapper program that emulates it, unless you are willing to have everything use a different signal in lieu of SIGINFO...)
